### class: Browser
* extends: [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)

A Browser is created when Playwright connects to a browser instance, either through [browserType.launch()]() or
[browserType.connect()]().

An example of using a [Browser] to create a [Page]:

```js
const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.

(async () => {
  const browser = await firefox.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');
  await browser.close();
})();
```

See [ChromiumBrowser], [FirefoxBrowser] and [WebKitBrowser] for browser-specific features. Note that
[browserType.connect()]() and [browserType.launch()]() always return a specific browser instance, based on the browser
being connected to or launched.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### event Browser.disconnected

Emitted when Browser gets disconnected from the browser application. This might happen because of one of the following:
* Browser application is closed or crashed.
* The [browser.close()]() method was called.

#### method Browser.close
- returns: <[Promise]>

In case this browser is obtained using [browserType.launch()](), closes the browser and all of its pages (if any were
opened).

In case this browser is obtained using [browserType.connect()](), clears all created contexts belonging to this browser
and disconnects from the browser server.

The [Browser] object itself is considered to be disposed and cannot be used anymore.

#### method Browser.contexts
- returns: <[Array]<[BrowserContext]>>

Returns an array of all open browser contexts. In a newly created browser, this will return zero browser contexts.

```js
const browser = await pw.webkit.launch();
console.log(browser.contexts().length); // prints `0`

const context = await browser.newContext();
console.log(browser.contexts().length); // prints `1`
```

#### method Browser.isConnected
- returns: <[boolean]>

Indicates that the browser is connected.

#### method Browser.newContext
- `options` <[Object]>
  - %%-shared-context-params-%%-as-is
  - %%-context-option-proxy-%%
  - %%-context-option-storage-state-%%
- returns: <[Promise]<[BrowserContext]>>

Creates a new browser context. It won't share cookies/cache with other browser contexts.

```js
(async () => {
  const browser = await playwright.firefox.launch();  // Or 'chromium' or 'webkit'.
  // Create a new incognito browser context.
  const context = await browser.newContext();
  // Create a new page in a pristine context.
  const page = await context.newPage();
  await page.goto('https://example.com');
})();
```

#### method Browser.newPage
- `options` <[Object]>
  - %%-shared-context-params-%%-as-is
  - %%-context-option-proxy-%%
  - %%-context-option-storage-state-%%
- returns: <[Promise]<[Page]>>

Creates a new page in a new browser context. Closing this page will close the context as well.

This is a convenience API that should only be used for the single-page scenarios and short snippets. Production code and
testing frameworks should explicitly create [browser.newContext()]() followed by the [browserContext.newPage()]() to
control their exact life times.

#### method Browser.version
- returns: <[string]>

Returns the browser version.

### class: BrowserContext
* extends: [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)

BrowserContexts provide a way to operate multiple independent browser sessions.

If a page opens another page, e.g. with a `window.open` call, the popup will belong to the parent page's browser
context.

Playwright allows creation of "incognito" browser contexts with `browser.newContext()` method. "Incognito" browser
contexts don't write any browsing data to disk.

```js
// Create a new incognito browser context
const context = await browser.newContext();
// Create a new page inside context.
const page = await context.newPage();
await page.goto('https://example.com');
// Dispose context once it's no longer needed.
await context.close();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### event BrowserContext.close

Emitted when Browser context gets closed. This might happen because of one of the following:
* Browser context is closed.
* Browser application is closed or crashed.
* The [browser.close()]() method was called.

#### event BrowserContext.page
- <[Page]>

The event is emitted when a new Page is created in the BrowserContext. The page may still be loading. The event will
also fire for popup pages. See also [page.on('popup')]() to receive events about popups relevant to a specific page.

The earliest moment that page is available is when it has navigated to the initial url. For example, when opening a
popup with `window.open('http://example.com')`, this event will fire when the network request to "http://example.com" is
done and its response has started loading in the popup.

```js
const [page] = await Promise.all([
  context.waitForEvent('page'),
  page.click('a[target=_blank]'),
]);
console.log(await page.evaluate('location.href'));
```

> **NOTE** Use [page.waitForLoadState()]() to wait until the page gets to a particular state (you should not need it in
most cases).

#### method BrowserContext.addCookies
- `cookies` <[Array]<[Object]>>
  - `name` <[string]> **required**
  - `value` <[string]> **required**
  - `url` <[string]> either url or domain / path are required
  - `domain` <[string]> either url or domain / path are required
  - `path` <[string]> either url or domain / path are required
  - `expires` <[number]> Unix time in seconds.
  - `httpOnly` <[boolean]>
  - `secure` <[boolean]>
  - `sameSite` <"Strict"|"Lax"|"None">
- returns: <[Promise]>

```js
await browserContext.addCookies([cookieObject1, cookieObject2]);
```

#### method BrowserContext.addInitScript
- `script` <[function]|[string]|[Object]> Script to be evaluated in all pages in the browser context.
  - `path` <[string]> Path to the JavaScript file. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw script content.
- `arg` <[Serializable]> Optional argument to pass to `script` (only supported when passing a function).
- returns: <[Promise]>

Adds a script which would be evaluated in one of the following scenarios:
* Whenever a page is created in the browser context or is navigated.
* Whenever a child frame is attached or navigated in any page in the browser context. In this case, the script is evaluated in the context of the newly attached frame.

The script is evaluated after the document was created but before any of its scripts were run. This is useful to amend
the JavaScript environment, e.g. to seed `Math.random`.

An example of overriding `Math.random` before the page loads:

```js
// preload.js
Math.random = () => 42;
```

```js
// In your playwright script, assuming the preload.js file is in same directory.
await browserContext.addInitScript({
  path: 'preload.js'
});
```

> **NOTE** The order of evaluation of multiple scripts installed via [browserContext.addInitScript()]() and
[page.addInitScript()]() is not defined.

#### method BrowserContext.browser
- returns: <[null]|[Browser]> Returns the browser instance of the context. If it was launched as a persistent context null gets returned.

#### method BrowserContext.clearCookies
- returns: <[Promise]>

Clears context cookies.

#### method BrowserContext.clearPermissions
- returns: <[Promise]>

Clears all permission overrides for the browser context.

```js
const context = await browser.newContext();
await context.grantPermissions(['clipboard-read']);
// do stuff ..
context.clearPermissions();
```

#### method BrowserContext.close
- returns: <[Promise]>

Closes the browser context. All the pages that belong to the browser context will be closed.

> **NOTE** the default browser context cannot be closed.

#### method BrowserContext.cookies
- `urls` <[string]|[Array]<[string]>> Optional list of URLs.
- returns: <[Promise]<[Array]<[Object]>>>
  - `name` <[string]>
  - `value` <[string]>
  - `domain` <[string]>
  - `path` <[string]>
  - `expires` <[number]> Unix time in seconds.
  - `httpOnly` <[boolean]>
  - `secure` <[boolean]>
  - `sameSite` <"Strict"|"Lax"|"None">

If no URLs are specified, this method returns all cookies. If URLs are specified, only cookies that affect those URLs
are returned.

#### method BrowserContext.exposeBinding
- `name` <[string]> Name of the function on the window object.
- `playwrightBinding` <[function]> Callback function that will be called in the Playwright's context.
- `options` <[Object]>
  - `handle` <[boolean]> Whether to pass the argument as a handle, instead of passing by value. When passing a handle, only one argument is supported. When passing by value, multiple arguments are supported.
- returns: <[Promise]>

The method adds a function called `name` on the `window` object of every frame in every page in the context. When
called, the function executes `playwrightBinding` in Node.js and returns a [Promise] which resolves to the return value
of `playwrightBinding`. If the `playwrightBinding` returns a [Promise], it will be awaited.

The first argument of the `playwrightBinding` function contains information about the caller: `{ browserContext:
BrowserContext, page: Page, frame: Frame }`.

See [page.exposeBinding()]() for page-only version.

An example of exposing page URL to all frames in all pages in the context:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.

(async () => {
  const browser = await webkit.launch({ headless: false });
  const context = await browser.newContext();
  await context.exposeBinding('pageURL', ({ page }) => page.url());
  const page = await context.newPage();
  await page.setContent(`
    <script>
      async function onClick() {
        document.querySelector('div').textContent = await window.pageURL();
      }
    </script>
    <button onclick="onClick()">Click me</button>
    <div></div>
  `);
  await page.click('button');
})();
```

An example of passing an element handle:

```js
await context.exposeBinding('clicked', async (source, element) => {
  console.log(await element.textContent());
}, { handle: true });
await page.setContent(`
  <script>
    document.addEventListener('click', event => window.clicked(event.target));
  </script>
  <div>Click me</div>
  <div>Or click me</div>
`);
```

#### method BrowserContext.exposeFunction
- `name` <[string]> Name of the function on the window object.
- `playwrightFunction` <[function]> Callback function that will be called in the Playwright's context.
- returns: <[Promise]>

The method adds a function called `name` on the `window` object of every frame in every page in the context. When
called, the function executes `playwrightFunction` in Node.js and returns a [Promise] which resolves to the return value
of `playwrightFunction`.

If the `playwrightFunction` returns a [Promise], it will be awaited.

See [page.exposeFunction()]() for page-only version.

An example of adding an `md5` function to all pages in the context:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
const crypto = require('crypto');

(async () => {
  const browser = await webkit.launch({ headless: false });
  const context = await browser.newContext();
  await context.exposeFunction('md5', text => crypto.createHash('md5').update(text).digest('hex'));
  const page = await context.newPage();
  await page.setContent(`
    <script>
      async function onClick() {
        document.querySelector('div').textContent = await window.md5('PLAYWRIGHT');
      }
    </script>
    <button onclick="onClick()">Click me</button>
    <div></div>
  `);
  await page.click('button');
})();
```

#### method BrowserContext.grantPermissions
- `permissions` <[Array]<[string]>> A permission or an array of permissions to grant. Permissions can be one of the following values:
  - `'geolocation'`
  - `'midi'`
  - `'midi-sysex'` (system-exclusive midi)
  - `'notifications'`
  - `'push'`
  - `'camera'`
  - `'microphone'`
  - `'background-sync'`
  - `'ambient-light-sensor'`
  - `'accelerometer'`
  - `'gyroscope'`
  - `'magnetometer'`
  - `'accessibility-events'`
  - `'clipboard-read'`
  - `'clipboard-write'`
  - `'payment-handler'`
- `options` <[Object]>
  - `origin` <[string]> The [origin] to grant permissions to, e.g. "https://example.com".
- returns: <[Promise]>

Grants specified permissions to the browser context. Only grants corresponding permissions to the given origin if
specified.

#### method BrowserContext.newPage
- returns: <[Promise]<[Page]>>

Creates a new page in the browser context.

#### method BrowserContext.pages
- returns: <[Array]<[Page]>> All open pages in the context. Non visible pages, such as `"background_page"`, will not be listed here. You can find them using [chromiumBrowserContext.backgroundPages()]().

#### method BrowserContext.route
- `url` <[string]|[RegExp]|[function]\([URL]\):[boolean]> A glob pattern, regex pattern or predicate receiving [URL] to match while routing.
- `handler` <[function]\([Route], [Request]\)> handler function to route the request.
- returns: <[Promise]>

Routing provides the capability to modify network requests that are made by any page in the browser context. Once route
is enabled, every request matching the url pattern will stall unless it's continued, fulfilled or aborted.

An example of a naïve handler that aborts all image requests:

```js
const context = await browser.newContext();
await context.route('**/*.{png,jpg,jpeg}', route => route.abort());
const page = await context.newPage();
await page.goto('https://example.com');
await browser.close();
```

or the same snippet using a regex pattern instead:

```js
const context = await browser.newContext();
await context.route(/(\.png$)|(\.jpg$)/, route => route.abort());
const page = await context.newPage();
await page.goto('https://example.com');
await browser.close();
```

Page routes (set up with [page.route()]()) take precedence over browser context routes when request matches both
handlers.

> **NOTE** Enabling routing disables http cache.

#### method BrowserContext.setDefaultNavigationTimeout
- `timeout` <[number]> Maximum navigation time in milliseconds

This setting will change the default maximum navigation time for the following methods and related shortcuts:
* [page.goBack()]()
* [page.goForward()]()
* [page.goto()]()
* [page.reload()]()
* [page.setContent()]()
* [page.waitForNavigation()]()

> **NOTE** [page.setDefaultNavigationTimeout()]() and [page.setDefaultTimeout()]() take priority over
[browserContext.setDefaultNavigationTimeout()]().

#### method BrowserContext.setDefaultTimeout
- `timeout` <[number]> Maximum time in milliseconds

This setting will change the default maximum time for all the methods accepting `timeout` option.

> **NOTE** [page.setDefaultNavigationTimeout()](), [page.setDefaultTimeout()]() and
[browserContext.setDefaultNavigationTimeout()]() take priority over [browserContext.setDefaultTimeout()]().

#### method BrowserContext.setExtraHTTPHeaders
- `headers` <[Object]<[string], [string]>> An object containing additional HTTP headers to be sent with every request. All header values must be strings.
- returns: <[Promise]>

The extra HTTP headers will be sent with every request initiated by any page in the context. These headers are merged
with page-specific extra HTTP headers set with [page.setExtraHTTPHeaders()](). If page overrides a particular header,
page-specific header value will be used instead of the browser context header value.

> **NOTE** `browserContext.setExtraHTTPHeaders` does not guarantee the order of headers in the outgoing requests.

#### method BrowserContext.setGeolocation
- `geolocation` <[null]|[Object]>
  - `latitude` <[number]> Latitude between -90 and 90. **required**
  - `longitude` <[number]> Longitude between -180 and 180. **required**
  - `accuracy` <[number]> Non-negative accuracy value. Defaults to `0`.
- returns: <[Promise]>

Sets the context's geolocation. Passing `null` or `undefined` emulates position unavailable.

```js
await browserContext.setGeolocation({latitude: 59.95, longitude: 30.31667});
```

> **NOTE** Consider using [browserContext.grantPermissions()]() to grant permissions for the browser context pages to
read its geolocation.

#### method BrowserContext.setHTTPCredentials
- `httpCredentials` <[null]|[Object]>
  - `username` <[string]> **required**
  - `password` <[string]> **required**
- returns: <[Promise]>

Provide credentials for [HTTP authentication](https://developer.mozilla.org/en-US/docs/Web/HTTP/Authentication).

> **NOTE** Browsers may cache credentials after successful authentication. Passing different credentials or passing
`null` to disable authentication will be unreliable. To remove or replace credentials, create a new browser context
instead.

#### method BrowserContext.setOffline
- `offline` <[boolean]> Whether to emulate network being offline for the browser context.
- returns: <[Promise]>

#### method BrowserContext.storageState
- returns: <[Promise]<[Object]>>
  - `cookies` <[Array]<[Object]>>
    - `name` <[string]>
    - `value` <[string]>
    - `domain` <[string]>
    - `path` <[string]>
    - `expires` <[number]> Unix time in seconds.
    - `httpOnly` <[boolean]>
    - `secure` <[boolean]>
    - `sameSite` <"Strict"|"Lax"|"None">
  - `origins` <[Array]<[Object]>>
    - `origin` <[string]>
    - `localStorage` <[Array]<[Object]>>
      - `name` <[string]>
      - `value` <[string]>

Returns storage state for this browser context, contains current cookies and local storage snapshot.

#### method BrowserContext.unroute
- `url` <[string]|[RegExp]|[function]\([URL]\):[boolean]> A glob pattern, regex pattern or predicate receiving [URL] used to register a routing with [browserContext.route()]().
- `handler` <[function]\([Route], [Request]\)> Optional handler function used to register a routing with [browserContext.route()]().
- returns: <[Promise]>

Removes a route created with [browserContext.route()](). When `handler` is not specified, removes all routes for the
`url`.

#### method BrowserContext.waitForEvent
- `event` <[string]> Event name, same one would pass into `browserContext.on(event)`.
- `optionsOrPredicate` <[Function]|[Object]> Either a predicate that receives an event or an options object. Optional.
  - `predicate` <[Function]> receives the event data and resolves to truthy value when the waiting should resolve.
  - %%-wait-for-timeout-%%
- returns: <[Promise]<[Object]>> Promise which resolves to the event data value.

Waits for event to fire and passes its value into the predicate function. Resolves when the predicate returns truthy
value. Will throw an error if the context closes before the event is fired.

```js
const context = await browser.newContext();
await context.grantPermissions(['geolocation']);
```

### class: Page
* extends: [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)

Page provides methods to interact with a single tab in a [Browser], or an [extension background
page](https://developer.chrome.com/extensions/background_pages) in Chromium. One [Browser] instance might have multiple
[Page] instances.

This example creates a page, navigates it to a URL, and then saves a screenshot:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.

(async () => {
  const browser = await webkit.launch();
  const context = await browser.newContext();
  const page = await context.newPage();
  await page.goto('https://example.com');
  await page.screenshot({path: 'screenshot.png'});
  await browser.close();
})();
```

The Page class emits various events (described below) which can be handled using any of Node's native
[`EventEmitter`](https://nodejs.org/api/events.html#events_class_eventemitter) methods, such as `on`, `once` or
`removeListener`.

This example logs a message for a single page `load` event:

```js
page.once('load', () => console.log('Page loaded!'));
```

To unsubscribe from events use the `removeListener` method:

```js
function logRequest(interceptedRequest) {
  console.log('A request was made:', interceptedRequest.url());
}
page.on('request', logRequest);
// Sometime later...
page.removeListener('request', logRequest);
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### event Page.close

Emitted when the page closes.

#### event Page.console
- <[ConsoleMessage]>

Emitted when JavaScript within the page calls one of console API methods, e.g. `console.log` or `console.dir`. Also
emitted if the page throws an error or a warning.

The arguments passed into `console.log` appear as arguments on the event handler.

An example of handling `console` event:

```js
page.on('console', msg => {
  for (let i = 0; i < msg.args().length; ++i)
    console.log(`${i}: ${msg.args()[i]}`);
});
page.evaluate(() => console.log('hello', 5, {foo: 'bar'}));
```

#### event Page.crash

Emitted when the page crashes. Browser pages might crash if they try to allocate too much memory. When the page crashes,
ongoing and subsequent operations will throw.

The most common way to deal with crashes is to catch an exception:

```js
try {
  // Crash might happen during a click.
  await page.click('button');
  // Or while waiting for an event.
  await page.waitForEvent('popup');
} catch (e) {
  // When the page crashes, exception message contains 'crash'.
}
```

However, when manually listening to events, it might be useful to avoid stalling when the page crashes. In this case,
handling `crash` event helps:

```js
await new Promise((resolve, reject) => {
  page.on('requestfinished', async request => {
    if (await someProcessing(request))
      resolve(request);
  });
  page.on('crash', error => reject(error));
});
```

#### event Page.dialog
- <[Dialog]>

Emitted when a JavaScript dialog appears, such as `alert`, `prompt`, `confirm` or `beforeunload`. Playwright can respond
to the dialog via [dialog.accept()]() or [dialog.dismiss()]() methods.

#### event Page.domcontentloaded

Emitted when the JavaScript [`DOMContentLoaded`](https://developer.mozilla.org/en-US/docs/Web/Events/DOMContentLoaded)
event is dispatched.

#### event Page.download
- <[Download]>

Emitted when attachment download started. User can access basic file operations on downloaded content via the passed
[Download] instance.

> **NOTE** Browser context **must** be created with the `acceptDownloads` set to `true` when user needs access to the
downloaded content. If `acceptDownloads` is not set or set to `false`, download events are emitted, but the actual
download is not performed and user has no access to the downloaded files.

#### event Page.filechooser
- <[FileChooser]>

Emitted when a file chooser is supposed to appear, such as after clicking the  `<input type=file>`. Playwright can
respond to it via setting the input files using [fileChooser.setFiles()]() that can be uploaded after that.

```js
page.on('filechooser', async (fileChooser) => {
  await fileChooser.setFiles('/tmp/myfile.pdf');
});
```

#### event Page.frameattached
- <[Frame]>

Emitted when a frame is attached.

#### event Page.framedetached
- <[Frame]>

Emitted when a frame is detached.

#### event Page.framenavigated
- <[Frame]>

Emitted when a frame is navigated to a new url.

#### event Page.load

Emitted when the JavaScript [`load`](https://developer.mozilla.org/en-US/docs/Web/Events/load) event is dispatched.

#### event Page.pageerror
- <[Error]> The exception message

Emitted when an uncaught exception happens within the page.

#### event Page.popup
- <[Page]> Page corresponding to "popup" window

Emitted when the page opens a new tab or window. This event is emitted in addition to the [browserContext.on('page')](),
but only for popups relevant to this page.

The earliest moment that page is available is when it has navigated to the initial url. For example, when opening a
popup with `window.open('http://example.com')`, this event will fire when the network request to "http://example.com" is
done and its response has started loading in the popup.

```js
const [popup] = await Promise.all([
  page.waitForEvent('popup'),
  page.evaluate(() => window.open('https://example.com')),
]);
console.log(await popup.evaluate('location.href'));
```

> **NOTE** Use [page.waitForLoadState()]() to wait until the page gets to a particular state (you should not need it in
most cases).

#### event Page.request
- <[Request]>

Emitted when a page issues a request. The [request] object is read-only. In order to intercept and mutate requests, see
[page.route()]() or [browserContext.route()]().

#### event Page.requestfailed
- <[Request]>

Emitted when a request fails, for example by timing out.

> **NOTE** HTTP Error responses, such as 404 or 503, are still successful responses from HTTP standpoint, so request
will complete with [page.on('requestfinished')]() event and not with [page.on('requestfailed')]().

#### event Page.requestfinished
- <[Request]>

Emitted when a request finishes successfully after downloading the response body. For a successful response, the
sequence of events is `request`, `response` and `requestfinished`.

#### event Page.response
- <[Response]>

Emitted when [response] status and headers are received for a request. For a successful response, the sequence of events
is `request`, `response` and `requestfinished`.

#### event Page.websocket
- <[WebSocket]> websocket

Emitted when <[WebSocket]> request is sent.

#### event Page.worker
- <[Worker]>

Emitted when a dedicated [WebWorker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API) is spawned by the
page.

#### method Page.$
- %%-query-selector-%%
- returns: <[Promise]<[null]|[ElementHandle]>>

The method finds an element matching the specified selector within the page. If no elements match the selector, the
return value resolves to `null`.

Shortcut for main frame's [frame.$()]().

#### method Page.$$
- %%-query-selector-%%
- returns: <[Promise]<[Array]<[ElementHandle]>>>

The method finds all elements matching the specified selector within the page. If no elements match the selector, the
return value resolves to `[]`.

Shortcut for main frame's [frame.$$()]().

#### method Page.$eval
- %%-query-selector-%%
- `pageFunction` <[function]\([Element]\)> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

The method finds an element matching the specified selector within the page and passes it as a first argument to
`pageFunction`. If no elements match the selector, the method throws an error.

If `pageFunction` returns a [Promise], then `page.$eval` would wait for the promise to resolve and return its value.

Examples:

```js
const searchValue = await page.$eval('#search', el => el.value);
const preloadHref = await page.$eval('link[rel=preload]', el => el.href);
const html = await page.$eval('.main-container', (e, suffix) => e.outerHTML + suffix, 'hello');
```

Shortcut for main frame's [frame.$eval()]().

#### method Page.$$eval
- %%-query-selector-%%
- `pageFunction` <[function]\([Array]<[Element]>\)> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

The method finds all elements matching the specified selector within the page and passes an array of matched elements as
a first argument to `pageFunction`.

If `pageFunction` returns a [Promise], then `page.$$eval` would wait for the promise to resolve and return its value.

Examples:

```js
const divsCounts = await page.$$eval('div', (divs, min) => divs.length >= min, 10);
```

#### namespace Page.accessibility
- returns: <[Accessibility]>

#### method Page.addInitScript
- `script` <[function]|[string]|[Object]> Script to be evaluated in the page.
  - `path` <[string]> Path to the JavaScript file. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw script content.
- `arg` <[Serializable]> Optional argument to pass to `script` (only supported when passing a function).
- returns: <[Promise]>

Adds a script which would be evaluated in one of the following scenarios:
* Whenever the page is navigated.
* Whenever the child frame is attached or navigated. In this case, the script is evaluated in the context of the newly attached frame.

The script is evaluated after the document was created but before any of its scripts were run. This is useful to amend
the JavaScript environment, e.g. to seed `Math.random`.

An example of overriding `Math.random` before the page loads:

```js
// preload.js
Math.random = () => 42;

// In your playwright script, assuming the preload.js file is in same directory
const preloadFile = fs.readFileSync('./preload.js', 'utf8');
await page.addInitScript(preloadFile);
```

> **NOTE** The order of evaluation of multiple scripts installed via [browserContext.addInitScript()]() and
[page.addInitScript()]() is not defined.

#### method Page.addScriptTag
- `script` <[Object]>
  - `url` <[string]> URL of a script to be added.
  - `path` <[string]> Path to the JavaScript file to be injected into frame. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw JavaScript content to be injected into frame.
  - `type` <[string]> Script type. Use 'module' in order to load a Javascript ES6 module. See [script](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script) for more details.
- returns: <[Promise]<[ElementHandle]>> which resolves to the added tag when the script's onload fires or when the script content was injected into frame.

Adds a `<script>` tag into the page with the desired url or content.

Shortcut for main frame's [frame.addScriptTag()]().

#### method Page.addStyleTag
- `style` <[Object]>
  - `url` <[string]> URL of the `<link>` tag.
  - `path` <[string]> Path to the CSS file to be injected into frame. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw CSS content to be injected into frame.
- returns: <[Promise]<[ElementHandle]>> which resolves to the added tag when the stylesheet's onload fires or when the CSS content was injected into frame.

Adds a `<link rel="stylesheet">` tag into the page with the desired url or a `<style type="text/css">` tag with the
content.

Shortcut for main frame's [frame.addStyleTag()]().

#### method Page.bringToFront
- returns: <[Promise]>

Brings page to front (activates tab).

#### method Page.check
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully checked.

This method checks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Ensure that matched element is a checkbox or a radio input. If not, this method rejects. If the element is already checked, this method returns immediately.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.
1. Ensure that the element is now checked. If not, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

Shortcut for main frame's [frame.check()]().

#### method Page.click
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-click-count-%%
  - %%-input-down-up-delay-%%
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully clicked.

This method clicks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

Shortcut for main frame's [frame.click()]().

#### method Page.close
- `options` <[Object]>
  - `runBeforeUnload` <[boolean]> Defaults to `false`. Whether to run the [before unload](https://developer.mozilla.org/en-US/docs/Web/Events/beforeunload) page handlers.
- returns: <[Promise]>

If `runBeforeUnload` is `false` the result will resolve only after the page has been closed. If `runBeforeUnload` is
`true` the method will **not** wait for the page to close. By default, `page.close()` **does not** run beforeunload
handlers.

> **NOTE** if `runBeforeUnload` is passed as true, a `beforeunload` dialog might be summoned
> and should be handled manually via [page.on('dialog')]() event.

#### method Page.content
- returns: <[Promise]<[string]>>

Gets the full HTML contents of the page, including the doctype.

#### method Page.context
- returns: <[BrowserContext]>

Get the browser context that the page belongs to.

#### namespace Page.coverage
- returns: <[null]|[ChromiumCoverage]>

Browser-specific Coverage implementation, only available for Chromium atm. See
[ChromiumCoverage](#class-chromiumcoverage) for more details.

#### method Page.dblclick
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-down-up-delay-%%
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully double clicked.

This method double clicks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to double click in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set. Note that if the first click of the `dblclick()` triggers a navigation event, this method will reject.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

> **NOTE** `page.dblclick()` dispatches two `click` events and a single `dblclick` event.

Shortcut for main frame's [frame.dblclick()]().

#### method Page.dispatchEvent
- %%-input-selector-%%
- `type` <[string]> DOM event type: `"click"`, `"dragstart"`, etc.
- `eventInit` <[EvaluationArgument]> Optional event-specific initialization properties.
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]>

The snippet below dispatches the `click` event on the element. Regardless of the visibility state of the elment, `click`
is dispatched. This is equivalend to calling
[element.click()](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/click).

```js
await page.dispatchEvent('button#submit', 'click');
```

Under the hood, it creates an instance of an event based on the given `type`, initializes it with `eventInit` properties
and dispatches it on the element. Events are `composed`, `cancelable` and bubble by default.

Since `eventInit` is event-specific, please refer to the events documentation for the lists of initial properties:
* [DragEvent](https://developer.mozilla.org/en-US/docs/Web/API/DragEvent/DragEvent)
* [FocusEvent](https://developer.mozilla.org/en-US/docs/Web/API/FocusEvent/FocusEvent)
* [KeyboardEvent](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/KeyboardEvent)
* [MouseEvent](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/MouseEvent)
* [PointerEvent](https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent/PointerEvent)
* [TouchEvent](https://developer.mozilla.org/en-US/docs/Web/API/TouchEvent/TouchEvent)
* [Event](https://developer.mozilla.org/en-US/docs/Web/API/Event/Event)

You can also specify `JSHandle` as the property value if you want live objects to be passed into the event:

```js
// Note you can only create DataTransfer in Chromium and Firefox
const dataTransfer = await page.evaluateHandle(() => new DataTransfer());
await page.dispatchEvent('#source', 'dragstart', { dataTransfer });
```

#### method Page.emulateMedia
- `params` <[Object]>
  - `media` <[null]|"screen"|"print"> Changes the CSS media type of the page. The only allowed values are `'screen'`, `'print'` and `null`. Passing `null` disables CSS media emulation. Omitting `media` or passing `undefined` does not change the emulated value.
  - `colorScheme` <[null]|"light"|"dark"|"no-preference"> Emulates `'prefers-colors-scheme'` media feature, supported values are `'light'`, `'dark'`, `'no-preference'`. Passing `null` disables color scheme emulation. Omitting `colorScheme` or passing `undefined` does not change the emulated value.
- returns: <[Promise]>

```js
await page.evaluate(() => matchMedia('screen').matches);
// → true
await page.evaluate(() => matchMedia('print').matches);
// → false

await page.emulateMedia({ media: 'print' });
await page.evaluate(() => matchMedia('screen').matches);
// → false
await page.evaluate(() => matchMedia('print').matches);
// → true

await page.emulateMedia({});
await page.evaluate(() => matchMedia('screen').matches);
// → true
await page.evaluate(() => matchMedia('print').matches);
// → false
```

```js
await page.emulateMedia({ colorScheme: 'dark' });
await page.evaluate(() => matchMedia('(prefers-color-scheme: dark)').matches);
// → true
await page.evaluate(() => matchMedia('(prefers-color-scheme: light)').matches);
// → false
await page.evaluate(() => matchMedia('(prefers-color-scheme: no-preference)').matches);
// → false
```

#### method Page.evaluate
- `pageFunction` <[function]|[string]> Function to be evaluated in the page context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

If the function passed to the `page.evaluate` returns a [Promise], then `page.evaluate` would wait for the promise to
resolve and return its value.

If the function passed to the `page.evaluate` returns a non-[Serializable] value, then `page.evaluate` resolves to
`undefined`. DevTools Protocol also supports transferring some additional values that are not serializable by `JSON`:
`-0`, `NaN`, `Infinity`, `-Infinity`, and bigint literals.

Passing argument to `pageFunction`:

```js
const result = await page.evaluate(([x, y]) => {
  return Promise.resolve(x * y);
}, [7, 8]);
console.log(result); // prints "56"
```

A string can also be passed in instead of a function:

```js
console.log(await page.evaluate('1 + 2')); // prints "3"
const x = 10;
console.log(await page.evaluate(`1 + ${x}`)); // prints "11"
```

[ElementHandle] instances can be passed as an argument to the `page.evaluate`:

```js
const bodyHandle = await page.$('body');
const html = await page.evaluate(([body, suffix]) => body.innerHTML + suffix, [bodyHandle, 'hello']);
await bodyHandle.dispose();
```

Shortcut for main frame's [frame.evaluate()]().

#### method Page.evaluateHandle
- `pageFunction` <[function]|[string]> Function to be evaluated in the page context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[JSHandle]>> Promise which resolves to the return value of `pageFunction` as in-page object (JSHandle)

The only difference between `page.evaluate` and `page.evaluateHandle` is that `page.evaluateHandle` returns in-page
object (JSHandle).

If the function passed to the `page.evaluateHandle` returns a [Promise], then `page.evaluateHandle` would wait for the
promise to resolve and return its value.

A string can also be passed in instead of a function:

```js
const aHandle = await page.evaluateHandle('document'); // Handle for the 'document'
```

[JSHandle] instances can be passed as an argument to the `page.evaluateHandle`:

```js
const aHandle = await page.evaluateHandle(() => document.body);
const resultHandle = await page.evaluateHandle(body => body.innerHTML, aHandle);
console.log(await resultHandle.jsonValue());
await resultHandle.dispose();
```

#### method Page.exposeBinding
- `name` <[string]> Name of the function on the window object.
- `playwrightBinding` <[function]> Callback function that will be called in the Playwright's context.
- `options` <[Object]>
  - `handle` <[boolean]> Whether to pass the argument as a handle, instead of passing by value. When passing a handle, only one argument is supported. When passing by value, multiple arguments are supported.
- returns: <[Promise]>

The method adds a function called `name` on the `window` object of every frame in this page. When called, the function
executes `playwrightBinding` in Node.js and returns a [Promise] which resolves to the return value of
`playwrightBinding`. If the `playwrightBinding` returns a [Promise], it will be awaited.

The first argument of the `playwrightBinding` function contains information about the caller: `{ browserContext:
BrowserContext, page: Page, frame: Frame }`.

See [browserContext.exposeBinding()]() for the context-wide version.

> **NOTE** Functions installed via `page.exposeBinding` survive navigations.

An example of exposing page URL to all frames in a page:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.

(async () => {
  const browser = await webkit.launch({ headless: false });
  const context = await browser.newContext();
  const page = await context.newPage();
  await page.exposeBinding('pageURL', ({ page }) => page.url());
  await page.setContent(`
    <script>
      async function onClick() {
        document.querySelector('div').textContent = await window.pageURL();
      }
    </script>
    <button onclick="onClick()">Click me</button>
    <div></div>
  `);
  await page.click('button');
})();
```

An example of passing an element handle:

```js
await page.exposeBinding('clicked', async (source, element) => {
  console.log(await element.textContent());
}, { handle: true });
await page.setContent(`
  <script>
    document.addEventListener('click', event => window.clicked(event.target));
  </script>
  <div>Click me</div>
  <div>Or click me</div>
`);
```

#### method Page.exposeFunction
- `name` <[string]> Name of the function on the window object
- `playwrightFunction` <[function]> Callback function which will be called in Playwright's context.
- returns: <[Promise]>

The method adds a function called `name` on the `window` object of every frame in the page. When called, the function
executes `playwrightFunction` in Node.js and returns a [Promise] which resolves to the return value of
`playwrightFunction`.

If the `playwrightFunction` returns a [Promise], it will be awaited.

See [browserContext.exposeFunction()]() for context-wide exposed function.

> **NOTE** Functions installed via `page.exposeFunction` survive navigations.

An example of adding an `md5` function to the page:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.
const crypto = require('crypto');

(async () => {
  const browser = await webkit.launch({ headless: false });
  const page = await browser.newPage();
  await page.exposeFunction('md5', text => crypto.createHash('md5').update(text).digest('hex'));
  await page.setContent(`
    <script>
      async function onClick() {
        document.querySelector('div').textContent = await window.md5('PLAYWRIGHT');
      }
    </script>
    <button onclick="onClick()">Click me</button>
    <div></div>
  `);
  await page.click('button');
})();
```

An example of adding a `window.readfile` function to the page:

```js
const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.
const fs = require('fs');

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  page.on('console', msg => console.log(msg.text()));
  await page.exposeFunction('readfile', async filePath => {
    return new Promise((resolve, reject) => {
      fs.readFile(filePath, 'utf8', (err, text) => {
        if (err)
          reject(err);
        else
          resolve(text);
      });
    });
  });
  await page.evaluate(async () => {
    // use window.readfile to read contents of a file
    const content = await window.readfile('/etc/hosts');
    console.log(content);
  });
  await browser.close();
})();
```

#### method Page.fill
- %%-input-selector-%%
- `value` <[string]> Value to fill for the `<input>`, `<textarea>` or `[contenteditable]` element.
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

This method waits for an element matching `selector`, waits for [actionability](./actionability.md) checks, focuses the
element, fills it and triggers an `input` event after filling. If the element matching `selector` is not an `<input>`,
`<textarea>` or `[contenteditable]` element, this method throws an error. Note that you can pass an empty string to
clear the input field.

To send fine-grained keyboard events, use [page.type()]().

Shortcut for main frame's [frame.fill()]()

#### method Page.focus
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]> Promise which resolves when the element matching `selector` is successfully focused. The promise will be rejected if there is no element matching `selector`.

This method fetches an element with `selector` and focuses it. If there's no element matching `selector`, the method
waits until a matching element appears in the DOM.

Shortcut for main frame's [frame.focus()]().

#### method Page.frame
- `frameSelector` <[string]|[Object]> Frame name or other frame lookup options.
  - `name` <[string]> frame name specified in the `iframe`'s `name` attribute
  - `url` <[string]|[RegExp]|[Function]> A glob pattern, regex pattern or predicate receiving frame's `url` as a [URL] object.
- returns: <[null]|[Frame]> frame matching the criteria. Returns `null` if no frame matches.

```js
const frame = page.frame('frame-name');
```

```js
const frame = page.frame({ url: /.*domain.*/ });
```

Returns frame matching the specified criteria. Either `name` or `url` must be specified.

#### method Page.frames
- returns: <[Array]<[Frame]>> An array of all frames attached to the page.

#### method Page.getAttribute
- %%-input-selector-%%
- `name` <[string]> Attribute name to get the value for.
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[string]>>

Returns element attribute value.

#### method Page.goBack
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect. If can not go back, resolves to `null`.

Navigate to the previous page in history.

#### method Page.goForward
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect. If can not go forward, resolves to `null`.

Navigate to the next page in history.

#### method Page.goto
- `url` <[string]> URL to navigate page to. The url should include scheme, e.g. `https://`.
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
  - `referer` <[string]> Referer header value. If provided it will take preference over the referer header value set by [page.setExtraHTTPHeaders()]().
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect.

`page.goto` will throw an error if:
* there's an SSL error (e.g. in case of self-signed certificates).
* target URL is invalid.
* the `timeout` is exceeded during navigation.
* the remote server does not respond or is unreachable.
* the main resource failed to load.

`page.goto` will not throw an error when any valid HTTP status code is returned by the remote server, including 404 "Not
Found" and 500 "Internal Server Error".  The status code for such responses can be retrieved by calling
[response.status()]().

> **NOTE** `page.goto` either throws an error or returns a main resource response. The only exceptions are navigation to
`about:blank` or navigation to the same URL with a different hash, which would succeed and return `null`.
> **NOTE** Headless mode doesn't support navigation to a PDF document. See the [upstream
issue](https://bugs.chromium.org/p/chromium/issues/detail?id=761295).

Shortcut for main frame's [frame.goto()]()

#### method Page.hover
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully hovered.

This method hovers over an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to hover over the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

Shortcut for main frame's [frame.hover()]().

#### method Page.innerHTML
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[string]>>

Resolves to the `element.innerHTML`.

#### method Page.innerText
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[string]>>

Resolves to the `element.innerText`.

#### method Page.isClosed
- returns: <[boolean]>

Indicates that the page has been closed.

#### namespace Page.keyboard
- returns: <[Keyboard]>

#### method Page.mainFrame
- returns: <[Frame]> The page's main frame.

Page is guaranteed to have a main frame which persists during navigations.

#### namespace Page.mouse
- returns: <[Mouse]>

#### method Page.opener
- returns: <[Promise]<[null]|[Page]>> Promise which resolves to the opener for popup pages and `null` for others. If the opener has been closed already the promise may resolve to `null`.

#### method Page.pdf
- `options` <[Object]>
  - `path` <[string]> The file path to save the PDF to. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). If no path is provided, the PDF won't be saved to the disk.
  - `scale` <[number]> Scale of the webpage rendering. Defaults to `1`. Scale amount must be between 0.1 and 2.
  - `displayHeaderFooter` <[boolean]> Display header and footer. Defaults to `false`.
  - `headerTemplate` <[string]> HTML template for the print header. Should be valid HTML markup with following classes used to inject printing values into them:
    - `'date'` formatted print date
    - `'title'` document title
    - `'url'` document location
    - `'pageNumber'` current page number
    - `'totalPages'` total pages in the document
  - `footerTemplate` <[string]> HTML template for the print footer. Should use the same format as the `headerTemplate`.
  - `printBackground` <[boolean]> Print background graphics. Defaults to `false`.
  - `landscape` <[boolean]> Paper orientation. Defaults to `false`.
  - `pageRanges` <[string]> Paper ranges to print, e.g., '1-5, 8, 11-13'. Defaults to the empty string, which means print all pages.
  - `format` <[string]> Paper format. If set, takes priority over `width` or `height` options. Defaults to 'Letter'.
  - `width` <[string]|[number]> Paper width, accepts values labeled with units.
  - `height` <[string]|[number]> Paper height, accepts values labeled with units.
  - `margin` <[Object]> Paper margins, defaults to none.
    - `top` <[string]|[number]> Top margin, accepts values labeled with units. Defaults to `0`.
    - `right` <[string]|[number]> Right margin, accepts values labeled with units. Defaults to `0`.
    - `bottom` <[string]|[number]> Bottom margin, accepts values labeled with units. Defaults to `0`.
    - `left` <[string]|[number]> Left margin, accepts values labeled with units. Defaults to `0`.
  - `preferCSSPageSize` <[boolean]> Give any CSS `@page` size declared in the page priority over what is declared in `width` and `height` or `format` options. Defaults to `false`, which will scale the content to fit the paper size.
- returns: <[Promise]<[Buffer]>> Promise which resolves with PDF buffer.

> **NOTE** Generating a pdf is currently only supported in Chromium headless.

`page.pdf()` generates a pdf of the page with `print` css media. To generate a pdf with `screen` media, call
[page.emulateMedia()]() before calling `page.pdf()`:

> **NOTE** By default, `page.pdf()` generates a pdf with modified colors for printing. Use the
[`-webkit-print-color-adjust`](https://developer.mozilla.org/en-US/docs/Web/CSS/-webkit-print-color-adjust) property to
force rendering of exact colors.

```js
// Generates a PDF with 'screen' media type.
await page.emulateMedia({media: 'screen'});
await page.pdf({path: 'page.pdf'});
```

The `width`, `height`, and `margin` options accept values labeled with units. Unlabeled values are treated as pixels.

A few examples:
* `page.pdf({width: 100})` - prints with width set to 100 pixels
* `page.pdf({width: '100px'})` - prints with width set to 100 pixels
* `page.pdf({width: '10cm'})` - prints with width set to 10 centimeters.

All possible units are:
* `px` - pixel
* `in` - inch
* `cm` - centimeter
* `mm` - millimeter

The `format` options are:
* `Letter`: 8.5in x 11in
* `Legal`: 8.5in x 14in
* `Tabloid`: 11in x 17in
* `Ledger`: 17in x 11in
* `A0`: 33.1in x 46.8in
* `A1`: 23.4in x 33.1in
* `A2`: 16.54in x 23.4in
* `A3`: 11.7in x 16.54in
* `A4`: 8.27in x 11.7in
* `A5`: 5.83in x 8.27in
* `A6`: 4.13in x 5.83in

> **NOTE** `headerTemplate` and `footerTemplate` markup have the following limitations:
> 1. Script tags inside templates are not evaluated.
> 2. Page styles are not visible inside templates.

#### method Page.press
- %%-input-selector-%%
- `key` <[string]> Name of the key to press or a character to generate, such as `ArrowLeft` or `a`.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

Focuses the element, and then uses [keyboard.down()]() and [keyboard.up()]().

`key` can specify the intended [keyboardEvent.key](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key)
value or a single character to generate the text for. A superset of the `key` values can be found
[here](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values). Examples of the keys are:

`F1` - `F12`, `Digit0`- `Digit9`, `KeyA`- `KeyZ`, `Backquote`, `Minus`, `Equal`, `Backslash`, `Backspace`, `Tab`,
`Delete`, `Escape`, `ArrowDown`, `End`, `Enter`, `Home`, `Insert`, `PageDown`, `PageUp`, `ArrowRight`, `ArrowUp`, etc.

Following modification shortcuts are also suported: `Shift`, `Control`, `Alt`, `Meta`, `ShiftLeft`.

Holding down `Shift` will type the text that corresponds to the `key` in the upper case.

If `key` is a single character, it is case-sensitive, so the values `a` and `A` will generate different respective
texts.

Shortcuts such as `key: "Control+o"` or `key: "Control+Shift+T"` are supported as well. When speficied with the
modifier, modifier is pressed and being held while the subsequent key is being pressed.

```js
const page = await browser.newPage();
await page.goto('https://keycode.info');
await page.press('body', 'A');
await page.screenshot({ path: 'A.png' });
await page.press('body', 'ArrowLeft');
await page.screenshot({ path: 'ArrowLeft.png' });
await page.press('body', 'Shift+O');
await page.screenshot({ path: 'O.png' });
await browser.close();
```

#### method Page.reload
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect.

#### method Page.route
- `url` <[string]|[RegExp]|[function]\([URL]\):[boolean]> A glob pattern, regex pattern or predicate receiving [URL] to match while routing.
- `handler` <[function]\([Route], [Request]\)> handler function to route the request.
- returns: <[Promise]>.

Routing provides the capability to modify network requests that are made by a page.

Once routing is enabled, every request matching the url pattern will stall unless it's continued, fulfilled or aborted.

> **NOTE** The handler will only be called for the first url if the response is a redirect.

An example of a naïve handler that aborts all image requests:

```js
const page = await browser.newPage();
await page.route('**/*.{png,jpg,jpeg}', route => route.abort());
await page.goto('https://example.com');
await browser.close();
```

or the same snippet using a regex pattern instead:

```js
const page = await browser.newPage();
await page.route(/(\.png$)|(\.jpg$)/, route => route.abort());
await page.goto('https://example.com');
await browser.close();
```

Page routes take precedence over browser context routes (set up with [browserContext.route()]()) when request matches
both handlers.

> **NOTE** Enabling routing disables http cache.

#### method Page.screenshot
- `options` <[Object]>
  - `path` <[string]> The file path to save the image to. The screenshot type will be inferred from file extension. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). If no path is provided, the image won't be saved to the disk.
  - `type` <"png"|"jpeg"> Specify screenshot type, defaults to `png`.
  - `quality` <[number]> The quality of the image, between 0-100. Not applicable to `png` images.
  - `fullPage` <[boolean]> When true, takes a screenshot of the full scrollable page, instead of the currently visible viewport. Defaults to `false`.
  - `clip` <[Object]> An object which specifies clipping of the resulting image. Should have the following fields:
    - `x` <[number]> x-coordinate of top-left corner of clip area
    - `y` <[number]> y-coordinate of top-left corner of clip area
    - `width` <[number]> width of clipping area
    - `height` <[number]> height of clipping area
  - `omitBackground` <[boolean]> Hides default white background and allows capturing screenshots with transparency. Not applicable to `jpeg` images. Defaults to `false`.
  - %%-input-timeout-%%
- returns: <[Promise]<[Buffer]>> Promise which resolves to buffer with the captured screenshot.

> **NOTE** Screenshots take at least 1/6 second on Chromium OS X and Chromium Windows. See https://crbug.com/741689 for
discussion.

#### method Page.selectOption
- %%-input-selector-%%
- `values` <[null]|[string]|[ElementHandle]|[Array]<[string]>|[Object]|[Array]<[ElementHandle]>|[Array]<[Object]>> Options to select. If the `<select>` has the `multiple` attribute, all matching options are selected, otherwise only the first option matching one of the passed options is selected. String values are equivalent to `{value:'string'}`. Option is considered matching if all specified properties match.
  - `value` <[string]> Matches by `option.value`.
  - `label` <[string]> Matches by `option.label`.
  - `index` <[number]> Matches by the index.
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]<[Array]<[string]>>> An array of option values that have been successfully selected.

Triggers a `change` and `input` event once all the provided options have been selected. If there's no `<select>` element
matching `selector`, the method throws an error.

```js
// single selection matching the value
page.selectOption('select#colors', 'blue');

// single selection matching both the value and the label
page.selectOption('select#colors', { label: 'Blue' });

// multiple selection
page.selectOption('select#colors', ['red', 'green', 'blue']);

```

Shortcut for main frame's [frame.selectOption()]()

#### method Page.setContent
- `html` <[string]> HTML markup to assign to the page.
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
- returns: <[Promise]>

#### method Page.setDefaultNavigationTimeout
- `timeout` <[number]> Maximum navigation time in milliseconds

This setting will change the default maximum navigation time for the following methods and related shortcuts:
* [page.goBack()]()
* [page.goForward()]()
* [page.goto()]()
* [page.reload()]()
* [page.setContent()]()
* [page.waitForNavigation()]()

> **NOTE** [page.setDefaultNavigationTimeout()]() takes priority over [page.setDefaultTimeout()](),
[browserContext.setDefaultTimeout()]() and [browserContext.setDefaultNavigationTimeout()]().

#### method Page.setDefaultTimeout
- `timeout` <[number]> Maximum time in milliseconds

This setting will change the default maximum time for all the methods accepting `timeout` option.

> **NOTE** [page.setDefaultNavigationTimeout()]() takes priority over [page.setDefaultTimeout()]().

#### method Page.setExtraHTTPHeaders
- `headers` <[Object]<[string], [string]>> An object containing additional HTTP headers to be sent with every request. All header values must be strings.
- returns: <[Promise]>

The extra HTTP headers will be sent with every request the page initiates.

> **NOTE** page.setExtraHTTPHeaders does not guarantee the order of headers in the outgoing requests.

#### method Page.setInputFiles
- %%-input-selector-%%
- %%-input-files-%%
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

This method expects `selector` to point to an [input
element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input).

Sets the value of the file input to these file paths or files. If some of the `filePaths` are relative paths, then they
are resolved relative to the [current working directory](https://nodejs.org/api/process.html#process_process_cwd). For
empty array, clears the selected files.

#### method Page.setViewportSize
- `viewportSize` <[Object]>
  - `width` <[number]> page width in pixels. **required**
  - `height` <[number]> page height in pixels. **required**
- returns: <[Promise]>

In the case of multiple pages in a single browser, each page can have its own viewport size. However,
[browser.newContext()]() allows to set viewport size (and more) for all pages in the context at once.

`page.setViewportSize` will resize the page. A lot of websites don't expect phones to change size, so you should set the
viewport size before navigating to the page.

```js
const page = await browser.newPage();
await page.setViewportSize({
  width: 640,
  height: 480,
});
await page.goto('https://example.com');
```

#### method Page.tap
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-no-wait-after-%%
  - %%-input-force-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully tapped.

This method taps an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.touchscreen](#pagetouchscreen#pagetouchscreen) to tap the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

> **NOTE** `page.tap()` requires that the `hasTouch` option of the browser context be set to true.

Shortcut for main frame's [frame.tap()]().

#### method Page.textContent
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[string]>>

Resolves to the `element.textContent`.

#### method Page.title
- returns: <[Promise]<[string]>> The page's title.

Shortcut for main frame's [frame.title()]().

#### namespace Page.touchscreen
- returns: <[Touchscreen]>

#### method Page.type
- %%-input-selector-%%
- `text` <[string]> A text to type into a focused element.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

Sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text. `page.type` can be used to send
fine-grained keyboard events. To fill values in form fields, use [page.fill()]().

To press a special key, like `Control` or `ArrowDown`, use [keyboard.press()]().

```js
await page.type('#mytextarea', 'Hello'); // Types instantly
await page.type('#mytextarea', 'World', {delay: 100}); // Types slower, like a user
```

Shortcut for main frame's [frame.type()]().

#### method Page.uncheck
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully unchecked.

This method unchecks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Ensure that matched element is a checkbox or a radio input. If not, this method rejects. If the element is already unchecked, this method returns immediately.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.
1. Ensure that the element is now unchecked. If not, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

Shortcut for main frame's [frame.uncheck()]().

#### method Page.unroute
- `url` <[string]|[RegExp]|[function]\([URL]\):[boolean]> A glob pattern, regex pattern or predicate receiving [URL] to match while routing.
- `handler` <[function]\([Route], [Request]\)> Optional handler function to route the request.
- returns: <[Promise]>

Removes a route created with [page.route()](). When `handler` is not specified, removes all routes for the `url`.

#### method Page.url
- returns: <[string]>

Shortcut for main frame's [frame.url()]().

#### method Page.video
- returns: <[null]|[Video]>

Video object associated with this page.

#### method Page.viewportSize
- returns: <[null]|[Object]>
  - `width` <[number]> page width in pixels.
  - `height` <[number]> page height in pixels.

#### method Page.waitForEvent
- `event` <[string]> Event name, same one would pass into `page.on(event)`.
- `optionsOrPredicate` <[Function]|[Object]> Either a predicate that receives an event or an options object. Optional.
  - `predicate` <[Function]> receives the event data and resolves to truthy value when the waiting should resolve.
  - %%-wait-for-timeout-%%
- returns: <[Promise]<[Object]>> Promise which resolves to the event data value.

Waits for event to fire and passes its value into the predicate function. Resolves when the predicate returns truthy
value. Will throw an error if the page is closed before the event is fired.

#### method Page.waitForFunction
- `pageFunction` <[function]|[string]> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- `options` <[Object]>
  - `polling` <[number]|"raf"> If `polling` is `'raf'`, then `pageFunction` is constantly executed in `requestAnimationFrame` callback. If `polling` is a number, then it is treated as an interval in milliseconds at which the function would be executed. Defaults to `raf`.
  - %%-wait-for-timeout-%%
- returns: <[Promise]<[JSHandle]>> Promise which resolves when the `pageFunction` returns a truthy value. It resolves to a JSHandle of the truthy value.

The `waitForFunction` can be used to observe viewport size change:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.

(async () => {
  const browser = await webkit.launch();
  const page = await browser.newPage();
  const watchDog = page.waitForFunction('window.innerWidth < 100');
  await page.setViewportSize({width: 50, height: 50});
  await watchDog;
  await browser.close();
})();
```

To pass an argument from Node.js to the predicate of `page.waitForFunction` function:

```js
const selector = '.foo';
await page.waitForFunction(selector => !!document.querySelector(selector), selector);
```

Shortcut for main frame's [frame.waitForFunction()]().

#### method Page.waitForLoadState
- `state` <"load"|"domcontentloaded"|"networkidle"> Load state to wait for, defaults to `load`. If the state has been already reached while loading current document, the method resolves immediately. Optional.
  - `'load'` - wait for the `load` event to be fired.
  - `'domcontentloaded'` - wait for the `DOMContentLoaded` event to be fired.
  - `'networkidle'` - wait until there are no network connections for at least `500` ms.
- `options` <[Object]>
  - %%-navigation-timeout-%%
- returns: <[Promise]> Promise which resolves when the required load state has been reached.

This resolves when the page reaches a required load state, `load` by default. The navigation must have been committed
when this method is called. If current document has already reached the required state, resolves immediately.

```js
await page.click('button'); // Click triggers navigation.
await page.waitForLoadState(); // The promise resolves after 'load' event.
```

```js
const [popup] = await Promise.all([
  page.waitForEvent('popup'),
  page.click('button'), // Click triggers a popup.
])
await popup.waitForLoadState('domcontentloaded'); // The promise resolves after 'domcontentloaded' event.
console.log(await popup.title()); // Popup is ready to use.
```

Shortcut for main frame's [frame.waitForLoadState()]().

#### method Page.waitForNavigation
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - `url` <[string]|[RegExp]|[Function]> A glob pattern, regex pattern or predicate receiving [URL] to match while waiting for the navigation.
  - %%-navigation-wait-until-%%
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect. In case of navigation to a different anchor or navigation due to History API usage, the navigation will resolve with `null`.

This resolves when the page navigates to a new URL or reloads. It is useful for when you run code which will indirectly
cause the page to navigate. e.g. The click target has an `onclick` handler that triggers navigation from a `setTimeout`.
Consider this example:

```js
const [response] = await Promise.all([
  page.waitForNavigation(), // The promise resolves after navigation has finished
  page.click('a.delayed-navigation'), // Clicking the link will indirectly cause a navigation
]);
```

**NOTE** Usage of the [History API](https://developer.mozilla.org/en-US/docs/Web/API/History_API) to change the URL is
considered a navigation.

Shortcut for main frame's [frame.waitForNavigation()]().

#### method Page.waitForRequest
- `urlOrPredicate` <[string]|[RegExp]|[Function]> Request URL string, regex or predicate receiving [Request] object.
- `options` <[Object]>
  - `timeout` <[number]> Maximum wait time in milliseconds, defaults to 30 seconds, pass `0` to disable the timeout. The default value can be changed by using the [page.setDefaultTimeout()]() method.
- returns: <[Promise]<[Request]>> Promise which resolves to the matched request.

```js
const firstRequest = await page.waitForRequest('http://example.com/resource');
const finalRequest = await page.waitForRequest(request => request.url() === 'http://example.com' && request.method() === 'GET');
return firstRequest.url();
```

```js
await page.waitForRequest(request => request.url().searchParams.get('foo') === 'bar' && request.url().searchParams.get('foo2') === 'bar2');
```

#### method Page.waitForResponse
- `urlOrPredicate` <[string]|[RegExp]|[function]\([Response]\):[boolean]> Request URL string, regex or predicate receiving [Response] object.
- `options` <[Object]>
  - `timeout` <[number]> Maximum wait time in milliseconds, defaults to 30 seconds, pass `0` to disable the timeout. The default value can be changed by using the [browserContext.setDefaultTimeout()]() or [page.setDefaultTimeout()]() methods.
- returns: <[Promise]<[Response]>> Promise which resolves to the matched response.

```js
const firstResponse = await page.waitForResponse('https://example.com/resource');
const finalResponse = await page.waitForResponse(response => response.url() === 'https://example.com' && response.status() === 200);
return finalResponse.ok();
```

#### method Page.waitForSelector
- %%-query-selector-%%
- `options` <[Object]>
  - %%-wait-for-selector-state-%%
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[ElementHandle]>> Promise which resolves when element specified by selector satisfies `state` option. Resolves to `null` if waiting for `hidden` or `detached`.

Wait for the `selector` to satisfy `state` option (either appear/disappear from dom, or become visible/hidden). If at
the moment of calling the method `selector` already satisfies the condition, the method will return immediately. If the
selector doesn't satisfy the condition for the `timeout` milliseconds, the function will throw.

This method works across navigations:

```js
const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  let currentURL;
  page
    .waitForSelector('img')
    .then(() => console.log('First URL with image: ' + currentURL));
  for (currentURL of ['https://example.com', 'https://google.com', 'https://bbc.com']) {
    await page.goto(currentURL);
  }
  await browser.close();
})();
```

#### method Page.waitForTimeout
- `timeout` <[number]> A timeout to wait for
- returns: <[Promise]>

Returns a promise that resolves after the timeout.

Note that `page.waitForTimeout()` should only be used for debugging. Tests using the timer in production are going to be
flaky. Use signals such as network events, selectors becoming visible and others instead.

```js
// wait for 1 second
await page.waitForTimeout(1000);
```

Shortcut for main frame's [frame.waitForTimeout()]().

#### method Page.workers
- returns: <[Array]<[Worker]>> This method returns all of the dedicated [WebWorkers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API) associated with the page.

> **NOTE** This does not contain ServiceWorkers

### class: Frame

At every point of time, page exposes its current frame tree via the [page.mainFrame()]() and [frame.childFrames()]()
methods.

[Frame] object's lifecycle is controlled by three events, dispatched on the page object:
- [page.on('frameattached')]() - fired when the frame gets attached to the page. A Frame can be attached to the page only once.
- [page.on('framenavigated')]() - fired when the frame commits navigation to a different URL.
- [page.on('framedetached')]() - fired when the frame gets detached from the page.  A Frame can be detached from the page only once.

An example of dumping frame tree:

```js
const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.

(async () => {
  const browser = await firefox.launch();
  const page = await browser.newPage();
  await page.goto('https://www.google.com/chrome/browser/canary.html');
  dumpFrameTree(page.mainFrame(), '');
  await browser.close();

  function dumpFrameTree(frame, indent) {
    console.log(indent + frame.url());
    for (const child of frame.childFrames()) {
      dumpFrameTree(child, indent + '  ');
    }
  }
})();
```

An example of getting text from an iframe element:

```js
const frame = page.frames().find(frame => frame.name() === 'myframe');
const text = await frame.$eval('.selector', element => element.textContent);
console.log(text);
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Frame.$
- %%-query-selector-%%
- returns: <[Promise]<[null]|[ElementHandle]>> Promise which resolves to ElementHandle pointing to the frame element.

The method finds an element matching the specified selector within the frame. See [Working with
selectors](#working-with-selectors) for more details. If no elements match the selector, the return value resolves to
`null`.

#### method Frame.$$
- %%-query-selector-%%
- returns: <[Promise]<[Array]<[ElementHandle]>>> Promise which resolves to ElementHandles pointing to the frame elements.

The method finds all elements matching the specified selector within the frame. See [Working with
selectors](#working-with-selectors) for more details. If no elements match the selector, the return value resolves to
`[]`.

#### method Frame.$eval
- %%-query-selector-%%
- `pageFunction` <[function]\([Element]\)> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

The method finds an element matching the specified selector within the frame and passes it as a first argument to
`pageFunction`. See [Working with selectors](#working-with-selectors) for more details. If no elements match the
selector, the method throws an error.

If `pageFunction` returns a [Promise], then `frame.$eval` would wait for the promise to resolve and return its value.

Examples:

```js
const searchValue = await frame.$eval('#search', el => el.value);
const preloadHref = await frame.$eval('link[rel=preload]', el => el.href);
const html = await frame.$eval('.main-container', (e, suffix) => e.outerHTML + suffix, 'hello');
```

#### method Frame.$$eval
- %%-query-selector-%%
- `pageFunction` <[function]\([Array]<[Element]>\)> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

The method finds all elements matching the specified selector within the frame and passes an array of matched elements
as a first argument to `pageFunction`. See [Working with selectors](#working-with-selectors) for more details.

If `pageFunction` returns a [Promise], then `frame.$$eval` would wait for the promise to resolve and return its value.

Examples:

```js
const divsCounts = await frame.$$eval('div', (divs, min) => divs.length >= min, 10);
```

#### method Frame.addScriptTag
- `script` <[Object]>
  - `url` <[string]> URL of a script to be added.
  - `path` <[string]> Path to the JavaScript file to be injected into frame. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw JavaScript content to be injected into frame.
  - `type` <[string]> Script type. Use 'module' in order to load a Javascript ES6 module. See [script](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script) for more details.
- returns: <[Promise]<[ElementHandle]>> which resolves to the added tag when the script's onload fires or when the script content was injected into frame.

Adds a `<script>` tag into the page with the desired url or content.

#### method Frame.addStyleTag
- `style` <[Object]>
  - `url` <[string]> URL of the `<link>` tag.
  - `path` <[string]> Path to the CSS file to be injected into frame. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw CSS content to be injected into frame.
- returns: <[Promise]<[ElementHandle]>> which resolves to the added tag when the stylesheet's onload fires or when the CSS content was injected into frame.

Adds a `<link rel="stylesheet">` tag into the page with the desired url or a `<style type="text/css">` tag with the
content.

#### method Frame.check
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully checked.

This method checks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Ensure that matched element is a checkbox or a radio input. If not, this method rejects. If the element is already checked, this method returns immediately.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.
1. Ensure that the element is now checked. If not, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method Frame.childFrames
- returns: <[Array]<[Frame]>>

#### method Frame.click
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-click-count-%%
  - %%-input-down-up-delay-%%
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully clicked.

This method clicks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method Frame.content
- returns: <[Promise]<[string]>>

Gets the full HTML contents of the frame, including the doctype.

#### method Frame.dblclick
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-down-up-delay-%%
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully double clicked.

This method double clicks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to double click in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set. Note that if the first click of the `dblclick()` triggers a navigation event, this method will reject.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

> **NOTE** `frame.dblclick()` dispatches two `click` events and a single `dblclick` event.

#### method Frame.dispatchEvent
- %%-input-selector-%%
- `type` <[string]> DOM event type: `"click"`, `"dragstart"`, etc.
- `eventInit` <[EvaluationArgument]> Optional event-specific initialization properties.
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]>

The snippet below dispatches the `click` event on the element. Regardless of the visibility state of the elment, `click`
is dispatched. This is equivalend to calling
[element.click()](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/click).

```js
await frame.dispatchEvent('button#submit', 'click');
```

Under the hood, it creates an instance of an event based on the given `type`, initializes it with `eventInit` properties
and dispatches it on the element. Events are `composed`, `cancelable` and bubble by default.

Since `eventInit` is event-specific, please refer to the events documentation for the lists of initial properties:
* [DragEvent](https://developer.mozilla.org/en-US/docs/Web/API/DragEvent/DragEvent)
* [FocusEvent](https://developer.mozilla.org/en-US/docs/Web/API/FocusEvent/FocusEvent)
* [KeyboardEvent](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/KeyboardEvent)
* [MouseEvent](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/MouseEvent)
* [PointerEvent](https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent/PointerEvent)
* [TouchEvent](https://developer.mozilla.org/en-US/docs/Web/API/TouchEvent/TouchEvent)
* [Event](https://developer.mozilla.org/en-US/docs/Web/API/Event/Event)

You can also specify `JSHandle` as the property value if you want live objects to be passed into the event:

```js
// Note you can only create DataTransfer in Chromium and Firefox
const dataTransfer = await frame.evaluateHandle(() => new DataTransfer());
await frame.dispatchEvent('#source', 'dragstart', { dataTransfer });
```

#### method Frame.evaluate
- `pageFunction` <[function]|[string]> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

If the function passed to the `frame.evaluate` returns a [Promise], then `frame.evaluate` would wait for the promise to
resolve and return its value.

If the function passed to the `frame.evaluate` returns a non-[Serializable] value, then `frame.evaluate` resolves to
`undefined`. DevTools Protocol also supports transferring some additional values that are not serializable by `JSON`:
`-0`, `NaN`, `Infinity`, `-Infinity`, and bigint literals.

```js
const result = await frame.evaluate(([x, y]) => {
  return Promise.resolve(x * y);
}, [7, 8]);
console.log(result); // prints "56"
```

A string can also be passed in instead of a function.

```js
console.log(await frame.evaluate('1 + 2')); // prints "3"
```

[ElementHandle] instances can be passed as an argument to the `frame.evaluate`:

```js
const bodyHandle = await frame.$('body');
const html = await frame.evaluate(([body, suffix]) => body.innerHTML + suffix, [bodyHandle, 'hello']);
await bodyHandle.dispose();
```

#### method Frame.evaluateHandle
- `pageFunction` <[function]|[string]> Function to be evaluated in the page context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[JSHandle]>> Promise which resolves to the return value of `pageFunction` as in-page object (JSHandle)

The only difference between `frame.evaluate` and `frame.evaluateHandle` is that `frame.evaluateHandle` returns in-page
object (JSHandle).

If the function, passed to the `frame.evaluateHandle`, returns a [Promise], then `frame.evaluateHandle` would wait for
the promise to resolve and return its value.

```js
const aWindowHandle = await frame.evaluateHandle(() => Promise.resolve(window));
aWindowHandle; // Handle for the window object.
```

A string can also be passed in instead of a function.

```js
const aHandle = await frame.evaluateHandle('document'); // Handle for the 'document'.
```

[JSHandle] instances can be passed as an argument to the `frame.evaluateHandle`:

```js
const aHandle = await frame.evaluateHandle(() => document.body);
const resultHandle = await frame.evaluateHandle(([body, suffix]) => body.innerHTML + suffix, [aHandle, 'hello']);
console.log(await resultHandle.jsonValue());
await resultHandle.dispose();
```

#### method Frame.fill
- %%-input-selector-%%
- `value` <[string]> Value to fill for the `<input>`, `<textarea>` or `[contenteditable]` element.
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

This method waits for an element matching `selector`, waits for [actionability](./actionability.md) checks, focuses the
element, fills it and triggers an `input` event after filling. If the element matching `selector` is not an `<input>`,
`<textarea>` or `[contenteditable]` element, this method throws an error. Note that you can pass an empty string to
clear the input field.

To send fine-grained keyboard events, use [frame.type()]().

#### method Frame.focus
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]> Promise which resolves when the element matching `selector` is successfully focused. The promise will be rejected if there is no element matching `selector`.

This method fetches an element with `selector` and focuses it. If there's no element matching `selector`, the method
waits until a matching element appears in the DOM.

#### method Frame.frameElement
- returns: <[Promise]<[ElementHandle]>> Promise that resolves with a `frame` or `iframe` element handle which corresponds to this frame.

This is an inverse of [elementHandle.contentFrame()](). Note that returned handle actually belongs to the parent frame.

This method throws an error if the frame has been detached before `frameElement()` returns.

```js
const frameElement = await frame.frameElement();
const contentFrame = await frameElement.contentFrame();
console.log(frame === contentFrame);  // -> true
```

#### method Frame.getAttribute
- %%-input-selector-%%
- `name` <[string]> Attribute name to get the value for.
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[string]>>

Returns element attribute value.

#### method Frame.goto
- `url` <[string]> URL to navigate frame to. The url should include scheme, e.g. `https://`.
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
  - `referer` <[string]> Referer header value. If provided it will take preference over the referer header value set by [page.setExtraHTTPHeaders()]().
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect.

`frame.goto` will throw an error if:
* there's an SSL error (e.g. in case of self-signed certificates).
* target URL is invalid.
* the `timeout` is exceeded during navigation.
* the remote server does not respond or is unreachable.
* the main resource failed to load.

`frame.goto` will not throw an error when any valid HTTP status code is returned by the remote server, including 404
"Not Found" and 500 "Internal Server Error".  The status code for such responses can be retrieved by calling
[response.status()]().

> **NOTE** `frame.goto` either throws an error or returns a main resource response. The only exceptions are navigation
to `about:blank` or navigation to the same URL with a different hash, which would succeed and return `null`.
> **NOTE** Headless mode doesn't support navigation to a PDF document. See the [upstream
issue](https://bugs.chromium.org/p/chromium/issues/detail?id=761295).

#### method Frame.hover
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully hovered.

This method hovers over an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to hover over the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method Frame.innerHTML
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[string]>>

Resolves to the `element.innerHTML`.

#### method Frame.innerText
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[string]>>

Resolves to the `element.innerText`.

#### method Frame.isDetached
- returns: <[boolean]>

Returns `true` if the frame has been detached, or `false` otherwise.

#### method Frame.name
- returns: <[string]>

Returns frame's name attribute as specified in the tag.

If the name is empty, returns the id attribute instead.

> **NOTE** This value is calculated once when the frame is created, and will not update if the attribute is changed
later.

#### method Frame.page
- returns: <[Page]>

Returns the page containing this frame.

#### method Frame.parentFrame
- returns: <[null]|[Frame]> Parent frame, if any. Detached frames and main frames return `null`.

#### method Frame.press
- %%-input-selector-%%
- `key` <[string]> Name of the key to press or a character to generate, such as `ArrowLeft` or `a`.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

`key` can specify the intended [keyboardEvent.key](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key)
value or a single character to generate the text for. A superset of the `key` values can be found
[here](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values). Examples of the keys are:

`F1` - `F12`, `Digit0`- `Digit9`, `KeyA`- `KeyZ`, `Backquote`, `Minus`, `Equal`, `Backslash`, `Backspace`, `Tab`,
`Delete`, `Escape`, `ArrowDown`, `End`, `Enter`, `Home`, `Insert`, `PageDown`, `PageUp`, `ArrowRight`, `ArrowUp`, etc.

Following modification shortcuts are also suported: `Shift`, `Control`, `Alt`, `Meta`, `ShiftLeft`.

Holding down `Shift` will type the text that corresponds to the `key` in the upper case.

If `key` is a single character, it is case-sensitive, so the values `a` and `A` will generate different respective
texts.

Shortcuts such as `key: "Control+o"` or `key: "Control+Shift+T"` are supported as well. When speficied with the
modifier, modifier is pressed and being held while the subsequent key is being pressed.

#### method Frame.selectOption
- %%-query-selector-%%
- `values` <[null]|[string]|[ElementHandle]|[Array]<[string]>|[Object]|[Array]<[ElementHandle]>|[Array]<[Object]>> Options to select. If the `<select>` has the `multiple` attribute, all matching options are selected, otherwise only the first option matching one of the passed options is selected. String values are equivalent to `{value:'string'}`. Option is considered matching if all specified properties match.
  - `value` <[string]> Matches by `option.value`.
  - `label` <[string]> Matches by `option.label`.
  - `index` <[number]> Matches by the index.
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]<[Array]<[string]>>> An array of option values that have been successfully selected.

Triggers a `change` and `input` event once all the provided options have been selected. If there's no `<select>` element
matching `selector`, the method throws an error.

```js
// single selection matching the value
frame.selectOption('select#colors', 'blue');

// single selection matching both the value and the label
frame.selectOption('select#colors', { label: 'Blue' });

// multiple selection
frame.selectOption('select#colors', 'red', 'green', 'blue');
```

#### method Frame.setContent
- `html` <[string]> HTML markup to assign to the page.
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - %%-navigation-wait-until-%%
- returns: <[Promise]>

#### method Frame.setInputFiles
- %%-input-selector-%%
- %%-input-files-%%
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

This method expects `selector` to point to an [input
element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input).

Sets the value of the file input to these file paths or files. If some of the `filePaths` are relative paths, then they
are resolved relative to the [current working directory](https://nodejs.org/api/process.html#process_process_cwd). For
empty array, clears the selected files.

#### method Frame.tap
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-no-wait-after-%%
  - %%-input-force-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully tapped.

This method taps an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.touchscreen](#pagetouchscreen#pagetouchscreen) to tap the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

> **NOTE** `frame.tap()` requires that the `hasTouch` option of the browser context be set to true.

#### method Frame.textContent
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[string]>>

Resolves to the `element.textContent`.

#### method Frame.title
- returns: <[Promise]<[string]>> The page's title.

#### method Frame.type
- %%-input-selector-%%
- `text` <[string]> A text to type into a focused element.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

Sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text. `frame.type` can be used to
send fine-grained keyboard events. To fill values in form fields, use [frame.fill()]().

To press a special key, like `Control` or `ArrowDown`, use [keyboard.press()]().

```js
await frame.type('#mytextarea', 'Hello'); // Types instantly
await frame.type('#mytextarea', 'World', {delay: 100}); // Types slower, like a user
```

#### method Frame.uncheck
- %%-input-selector-%%
- `options` <[Object]>
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element matching `selector` is successfully unchecked.

This method checks an element matching `selector` by performing the following steps:
1. Find an element match matching `selector`. If there is none, wait until a matching element is attached to the DOM.
1. Ensure that matched element is a checkbox or a radio input. If not, this method rejects. If the element is already unchecked, this method returns immediately.
1. Wait for [actionability](./actionability.md) checks on the matched element, unless `force` option is set. If the element is detached during the checks, the whole action is retried.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.
1. Ensure that the element is now unchecked. If not, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method Frame.url
- returns: <[string]>

Returns frame's url.

#### method Frame.waitForFunction
- `pageFunction` <[function]|[string]> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- `options` <[Object]>
  - `polling` <[number]|"raf"> If `polling` is `'raf'`, then `pageFunction` is constantly executed in `requestAnimationFrame` callback. If `polling` is a number, then it is treated as an interval in milliseconds at which the function would be executed. Defaults to `raf`.
  - %%-wait-for-timeout-%%
- returns: <[Promise]<[JSHandle]>> Promise which resolves when the `pageFunction` returns a truthy value. It resolves to a JSHandle of the truthy value.

The `waitForFunction` can be used to observe viewport size change:

```js
const { firefox } = require('playwright');  // Or 'chromium' or 'webkit'.

(async () => {
  const browser = await firefox.launch();
  const page = await browser.newPage();
  const watchDog = page.mainFrame().waitForFunction('window.innerWidth < 100');
  page.setViewportSize({width: 50, height: 50});
  await watchDog;
  await browser.close();
})();
```

To pass an argument from Node.js to the predicate of `frame.waitForFunction` function:

```js
const selector = '.foo';
await frame.waitForFunction(selector => !!document.querySelector(selector), selector);
```

#### method Frame.waitForLoadState
- `state` <"load"|"domcontentloaded"|"networkidle"> Load state to wait for, defaults to `load`. If the state has been already reached while loading current document, the method resolves immediately. Optional.
  - `'load'` - wait for the `load` event to be fired.
  - `'domcontentloaded'` - wait for the `DOMContentLoaded` event to be fired.
  - `'networkidle'` - wait until there are no network connections for at least `500` ms.
- `options` <[Object]>
  - %%-navigation-timeout-%%
- returns: <[Promise]> Promise which resolves when the required load state has been reached.

This resolves when the frame reaches a required load state, `load` by default. The navigation must have been committed
when this method is called. If current document has already reached the required state, resolves immediately.

```js
await frame.click('button'); // Click triggers navigation.
await frame.waitForLoadState(); // The promise resolves after 'load' event.
```

#### method Frame.waitForNavigation
- `options` <[Object]>
  - %%-navigation-timeout-%%
  - `url` <[string]|[RegExp]|[Function]> URL string, URL regex pattern or predicate receiving [URL] to match while waiting for the navigation.
  - %%-navigation-wait-until-%%
- returns: <[Promise]<[null]|[Response]>> Promise which resolves to the main resource response. In case of multiple redirects, the navigation will resolve with the response of the last redirect. In case of navigation to a different anchor or navigation due to History API usage, the navigation will resolve with `null`.

This resolves when the frame navigates to a new URL. It is useful for when you run code which will indirectly cause the
frame to navigate. Consider this example:

```js
const [response] = await Promise.all([
  frame.waitForNavigation(), // The navigation promise resolves after navigation has finished
  frame.click('a.my-link'), // Clicking the link will indirectly cause a navigation
]);
```

**NOTE** Usage of the [History API](https://developer.mozilla.org/en-US/docs/Web/API/History_API) to change the URL is
considered a navigation.

#### method Frame.waitForSelector
- %%-query-selector-%%
- `options` <[Object]>
  - %%-wait-for-selector-state-%%
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[ElementHandle]>> Promise which resolves when element specified by selector satisfies `state` option. Resolves to `null` if waiting for `hidden` or `detached`.

Wait for the `selector` to satisfy `state` option (either appear/disappear from dom, or become visible/hidden). If at
the moment of calling the method `selector` already satisfies the condition, the method will return immediately. If the
selector doesn't satisfy the condition for the `timeout` milliseconds, the function will throw.

This method works across navigations:

```js
const { webkit } = require('playwright');  // Or 'chromium' or 'firefox'.

(async () => {
  const browser = await webkit.launch();
  const page = await browser.newPage();
  let currentURL;
  page.mainFrame()
    .waitForSelector('img')
    .then(() => console.log('First URL with image: ' + currentURL));
  for (currentURL of ['https://example.com', 'https://google.com', 'https://bbc.com']) {
    await page.goto(currentURL);
  }
  await browser.close();
})();
```

#### method Frame.waitForTimeout
- `timeout` <[number]> A timeout to wait for
- returns: <[Promise]>

Returns a promise that resolves after the timeout.

Note that `frame.waitForTimeout()` should only be used for debugging. Tests using the timer in production are going to
be flaky. Use signals such as network events, selectors becoming visible and others instead.

### class: ElementHandle
* extends: [JSHandle]

ElementHandle represents an in-page DOM element. ElementHandles can be created with the [page.$()]() method.

```js
const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');
  const hrefElement = await page.$('a');
  await hrefElement.click();
  // ...
})();
```

ElementHandle prevents DOM element from garbage collection unless the handle is disposed with [jsHandle.dispose()]().
ElementHandles are auto-disposed when their origin frame gets navigated.

ElementHandle instances can be used as an argument in [page.$eval()]() and [page.evaluate()]() methods.

<!-- GEN:toc -->
<!-- GEN:stop -->

<!-- GEN:toc-extends-JSHandle -->
<!-- GEN:stop -->

#### method ElementHandle.$
- %%-query-selector-%%
- returns: <[Promise]<[null]|[ElementHandle]>>

The method finds an element matching the specified selector in the `ElementHandle`'s subtree. See [Working with
selectors](#working-with-selectors) for more details. If no elements match the selector, the return value resolves to
`null`.

#### method ElementHandle.$$
- %%-query-selector-%%
- returns: <[Promise]<[Array]<[ElementHandle]>>>

The method finds all elements matching the specified selector in the `ElementHandle`s subtree. See [Working with
selectors](#working-with-selectors) for more details. If no elements match the selector, the return value resolves to
`[]`.

#### method ElementHandle.$eval
- %%-query-selector-%%
- `pageFunction` <[function]\([Element]\)> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

The method finds an element matching the specified selector in the `ElementHandle`s subtree and passes it as a first
argument to `pageFunction`. See [Working with selectors](#working-with-selectors) for more details. If no elements match
the selector, the method throws an error.

If `pageFunction` returns a [Promise], then `frame.$eval` would wait for the promise to resolve and return its value.

Examples:

```js
const tweetHandle = await page.$('.tweet');
expect(await tweetHandle.$eval('.like', node => node.innerText)).toBe('100');
expect(await tweetHandle.$eval('.retweets', node => node.innerText)).toBe('10');
```

#### method ElementHandle.$$eval
- %%-query-selector-%%
- `pageFunction` <[function]\([Array]<[Element]>\)> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

The method finds all elements matching the specified selector in the `ElementHandle`'s subtree and passes an array of
matched elements as a first argument to `pageFunction`. See [Working with selectors](#working-with-selectors) for more
details.

If `pageFunction` returns a [Promise], then `frame.$$eval` would wait for the promise to resolve and return its value.

Examples:

```html
<div class="feed">
  <div class="tweet">Hello!</div>
  <div class="tweet">Hi!</div>
</div>
```

```js
const feedHandle = await page.$('.feed');
expect(await feedHandle.$$eval('.tweet', nodes => nodes.map(n => n.innerText))).toEqual(['Hello!', 'Hi!']);
```

#### method ElementHandle.boundingBox
- returns: <[Promise]<[null]|[Object]>>
  - `x` <[number]> the x coordinate of the element in pixels.
  - `y` <[number]> the y coordinate of the element in pixels.
  - width <[number]> the width of the element in pixels.
  - height <[number]> the height of the element in pixels.

This method returns the bounding box of the element, or `null` if the element is not visible. The bounding box is
calculated relative to the main frame viewport - which is usually the same as the browser window.

Scrolling affects the returned bonding box, similarly to
[Element.getBoundingClientRect](https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect). That
means `x` and/or `y` may be negative.

Elements from child frames return the bounding box relative to the main frame, unlike the
[Element.getBoundingClientRect](https://developer.mozilla.org/en-US/docs/Web/API/Element/getBoundingClientRect).

Assuming the page is static, it is safe to use bounding box coordinates to perform input. For example, the following
snippet should click the center of the element.

```js
const box = await elementHandle.boundingBox();
await page.mouse.click(box.x + box.width / 2, box.y + box.height / 2);
```

#### method ElementHandle.check
- `options` <[Object]>
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element is successfully checked.

This method checks the element by performing the following steps:
1. Ensure that element is a checkbox or a radio input. If not, this method rejects. If the element is already checked, this method returns immediately.
1. Wait for [actionability](./actionability.md) checks on the element, unless `force` option is set.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.
1. Ensure that the element is now checked. If not, this method rejects.

If the element is detached from the DOM at any moment during the action, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method ElementHandle.click
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-click-count-%%
  - %%-input-down-up-delay-%%
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element is successfully clicked.

This method clicks the element by performing the following steps:
1. Wait for [actionability](./actionability.md) checks on the element, unless `force` option is set.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

If the element is detached from the DOM at any moment during the action, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method ElementHandle.contentFrame
- returns: <[Promise]<[null]|[Frame]>> Resolves to the content frame for element handles referencing iframe nodes, or `null` otherwise

#### method ElementHandle.dblclick
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-down-up-delay-%%
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element is successfully double clicked.

This method double clicks the element by performing the following steps:
1. Wait for [actionability](./actionability.md) checks on the element, unless `force` option is set.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to double click in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set. Note that if the first click of the `dblclick()` triggers a navigation event, this method will reject.

If the element is detached from the DOM at any moment during the action, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

> **NOTE** `elementHandle.dblclick()` dispatches two `click` events and a single `dblclick` event.

#### method ElementHandle.dispatchEvent
- `type` <[string]> DOM event type: `"click"`, `"dragstart"`, etc.
- `eventInit` <[EvaluationArgument]> Optional event-specific initialization properties.
- returns: <[Promise]>

The snippet below dispatches the `click` event on the element. Regardless of the visibility state of the elment, `click`
is dispatched. This is equivalend to calling
[element.click()](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/click).

```js
await elementHandle.dispatchEvent('click');
```

Under the hood, it creates an instance of an event based on the given `type`, initializes it with `eventInit` properties
and dispatches it on the element. Events are `composed`, `cancelable` and bubble by default.

Since `eventInit` is event-specific, please refer to the events documentation for the lists of initial properties:
* [DragEvent](https://developer.mozilla.org/en-US/docs/Web/API/DragEvent/DragEvent)
* [FocusEvent](https://developer.mozilla.org/en-US/docs/Web/API/FocusEvent/FocusEvent)
* [KeyboardEvent](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/KeyboardEvent)
* [MouseEvent](https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/MouseEvent)
* [PointerEvent](https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent/PointerEvent)
* [TouchEvent](https://developer.mozilla.org/en-US/docs/Web/API/TouchEvent/TouchEvent)
* [Event](https://developer.mozilla.org/en-US/docs/Web/API/Event/Event)

You can also specify `JSHandle` as the property value if you want live objects to be passed into the event:

```js
// Note you can only create DataTransfer in Chromium and Firefox
const dataTransfer = await page.evaluateHandle(() => new DataTransfer());
await elementHandle.dispatchEvent('dragstart', { dataTransfer });
```

#### method ElementHandle.fill
- `value` <[string]> Value to set for the `<input>`, `<textarea>` or `[contenteditable]` element.
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

This method waits for [actionability](./actionability.md) checks, focuses the element, fills it and triggers an `input`
event after filling. If the element is not an `<input>`, `<textarea>` or `[contenteditable]` element, this method throws
an error. Note that you can pass an empty string to clear the input field.

#### method ElementHandle.focus
- returns: <[Promise]>

Calls [focus](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/focus) on the element.

#### method ElementHandle.getAttribute
- `name` <[string]> Attribute name to get the value for.
- returns: <[Promise]<[null]|[string]>>

Returns element attribute value.

#### method ElementHandle.hover
- `options` <[Object]>
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element is successfully hovered.

This method hovers over the element by performing the following steps:
1. Wait for [actionability](./actionability.md) checks on the element, unless `force` option is set.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to hover over the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

If the element is detached from the DOM at any moment during the action, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method ElementHandle.innerHTML
- returns: <[Promise]<[string]>> Resolves to the `element.innerHTML`.

#### method ElementHandle.innerText
- returns: <[Promise]<[string]>> Resolves to the `element.innerText`.

#### method ElementHandle.ownerFrame
- returns: <[Promise]<[null]|[Frame]>> Returns the frame containing the given element.

#### method ElementHandle.press
- `key` <[string]> Name of the key to press or a character to generate, such as `ArrowLeft` or `a`.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

Focuses the element, and then uses [keyboard.down()]() and [keyboard.up()]().

`key` can specify the intended [keyboardEvent.key](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key)
value or a single character to generate the text for. A superset of the `key` values can be found
[here](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values). Examples of the keys are:

`F1` - `F12`, `Digit0`- `Digit9`, `KeyA`- `KeyZ`, `Backquote`, `Minus`, `Equal`, `Backslash`, `Backspace`, `Tab`,
`Delete`, `Escape`, `ArrowDown`, `End`, `Enter`, `Home`, `Insert`, `PageDown`, `PageUp`, `ArrowRight`, `ArrowUp`, etc.

Following modification shortcuts are also suported: `Shift`, `Control`, `Alt`, `Meta`, `ShiftLeft`.

Holding down `Shift` will type the text that corresponds to the `key` in the upper case.

If `key` is a single character, it is case-sensitive, so the values `a` and `A` will generate different respective
texts.

Shortcuts such as `key: "Control+o"` or `key: "Control+Shift+T"` are supported as well. When speficied with the
modifier, modifier is pressed and being held while the subsequent key is being pressed.

#### method ElementHandle.screenshot
- `options` <[Object]>
  - `path` <[string]> The file path to save the image to. The screenshot type will be inferred from file extension. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). If no path is provided, the image won't be saved to the disk.
  - `type` <"png"|"jpeg"> Specify screenshot type, defaults to `png`.
  - `quality` <[number]> The quality of the image, between 0-100. Not applicable to `png` images.
  - `omitBackground` <[boolean]> Hides default white background and allows capturing screenshots with transparency. Not applicable to `jpeg` images. Defaults to `false`.
  - %%-input-timeout-%%
- returns: <[Promise]<[Buffer]>> Promise which resolves to buffer with the captured screenshot.

This method waits for the [actionability](./actionability.md) checks, then scrolls element into view before taking a
screenshot. If the element is detached from DOM, the method throws an error.

#### method ElementHandle.scrollIntoViewIfNeeded
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]>

This method waits for [actionability](./actionability.md) checks, then tries to scroll element into view, unless it is
completely visible as defined by
[IntersectionObserver](https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API)'s ```ratio```.

Throws when ```elementHandle``` does not point to an element
[connected](https://developer.mozilla.org/en-US/docs/Web/API/Node/isConnected) to a Document or a ShadowRoot.

#### method ElementHandle.selectOption
- `values` <[null]|[string]|[ElementHandle]|[Array]<[string]>|[Object]|[Array]<[ElementHandle]>|[Array]<[Object]>> Options to select. If the `<select>` has the `multiple` attribute, all matching options are selected, otherwise only the first option matching one of the passed options is selected. String values are equivalent to `{value:'string'}`. Option is considered matching if all specified properties match.
  - `value` <[string]> Matches by `option.value`.
  - `label` <[string]> Matches by `option.label`.
  - `index` <[number]> Matches by the index.
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]<[Array]<[string]>>> An array of option values that have been successfully selected.

Triggers a `change` and `input` event once all the provided options have been selected. If element is not a `<select>`
element, the method throws an error.

```js
// single selection matching the value
handle.selectOption('blue');

// single selection matching both the value and the label
handle.selectOption({ label: 'Blue' });

// multiple selection
handle.selectOption('red', 'green', 'blue');

// multiple selection for blue, red and second option
handle.selectOption({ value: 'blue' }, { index: 2 }, 'red');
```

#### method ElementHandle.selectText
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]>

This method waits for [actionability](./actionability.md) checks, then focuses the element and selects all its text
content.

#### method ElementHandle.setInputFiles
- %%-input-files-%%
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

This method expects `elementHandle` to point to an [input
element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input).

Sets the value of the file input to these file paths or files. If some of the `filePaths` are relative paths, then they
are resolved relative to the [current working directory](https://nodejs.org/api/process.html#process_process_cwd). For
empty array, clears the selected files.

#### method ElementHandle.tap
- `options` <[Object]>
  - %%-input-position-%%
  - %%-input-modifiers-%%
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element is successfully tapped.

This method taps the element by performing the following steps:
1. Wait for [actionability](./actionability.md) checks on the element, unless `force` option is set.
1. Scroll the element into view if needed.
1. Use [page.touchscreen](#pagetouchscreen) to tap in the center of the element, or the specified `position`.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.

If the element is detached from the DOM at any moment during the action, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

> **NOTE** `elementHandle.tap()` requires that the `hasTouch` option of the browser context be set to true.

#### method ElementHandle.textContent
- returns: <[Promise]<[null]|[string]>> Resolves to the `node.textContent`.

#### method ElementHandle.toString
- returns: <[string]>

#### method ElementHandle.type
- `text` <[string]> A text to type into a focused element.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

Focuses the element, and then sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text.

To press a special key, like `Control` or `ArrowDown`, use [elementHandle.press()]().

```js
await elementHandle.type('Hello'); // Types instantly
await elementHandle.type('World', {delay: 100}); // Types slower, like a user
```

An example of typing into a text field and then submitting the form:

```js
const elementHandle = await page.$('input');
await elementHandle.type('some text');
await elementHandle.press('Enter');
```

#### method ElementHandle.uncheck
- `options` <[Object]>
  - %%-input-force-%%
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element is successfully unchecked.

This method checks the element by performing the following steps:
1. Ensure that element is a checkbox or a radio input. If not, this method rejects. If the element is already unchecked, this method returns immediately.
1. Wait for [actionability](./actionability.md) checks on the element, unless `force` option is set.
1. Scroll the element into view if needed.
1. Use [page.mouse](#pagemouse) to click in the center of the element.
1. Wait for initiated navigations to either succeed or fail, unless `noWaitAfter` option is set.
1. Ensure that the element is now unchecked. If not, this method rejects.

If the element is detached from the DOM at any moment during the action, this method rejects.

When all steps combined have not finished during the specified `timeout`, this method rejects with a [TimeoutError].
Passing zero timeout disables this.

#### method ElementHandle.waitForElementState
- `state` <"visible"|"hidden"|"stable"|"enabled"|"disabled"> A state to wait for, see below for more details.
- `options` <[Object]>
  - %%-input-timeout-%%
- returns: <[Promise]> Promise that resolves when the element satisfies the `state`.

Depending on the `state` parameter, this method waits for one of the [actionability](./actionability.md) checks to pass.
This method throws when the element is detached while waiting, unless waiting for the `"hidden"` state.
* `"visible"` Wait until the element is [visible](./actionability.md#visible).
* `"hidden"` Wait until the element is [not visible](./actionability.md#visible) or [not attached](./actionability.md#attached). Note that waiting for hidden does not throw when the element detaches.
* `"stable"` Wait until the element is both [visible](./actionability.md#visible) and [stable](./actionability.md#stable).
* `"enabled"` Wait until the element is [enabled](./actionability.md#enabled).
* `"disabled"` Wait until the element is [not enabled](./actionability.md#enabled).

If the element does not satisfy the condition for the `timeout` milliseconds, this method will throw.

#### method ElementHandle.waitForSelector
- %%-query-selector-%%
- `options` <[Object]>
  - %%-wait-for-selector-state-%%
  - %%-input-timeout-%%
- returns: <[Promise]<[null]|[ElementHandle]>> Promise that resolves when element specified by selector satisfies `state` option. Resolves to `null` if waiting for `hidden` or `detached`.

Wait for the `selector` relative to the element handle to satisfy `state` option (either appear/disappear from dom, or
become visible/hidden). If at the moment of calling the method `selector` already satisfies the condition, the method
will return immediately. If the selector doesn't satisfy the condition for the `timeout` milliseconds, the function will
throw.

```js
await page.setContent(`<div><span></span></div>`);
const div = await page.$('div');
// Waiting for the 'span' selector relative to the div.
const span = await div.waitForSelector('span', { state: 'attached' });
```

> **NOTE** This method does not work across navigations, use [page.waitForSelector()]() instead.

### class: JSHandle

JSHandle represents an in-page JavaScript object. JSHandles can be created with the [page.evaluateHandle()]() method.

```js
const windowHandle = await page.evaluateHandle(() => window);
// ...
```

JSHandle prevents the referenced JavaScript object being garbage collected unless the handle is exposed with
[jsHandle.dispose()](). JSHandles are auto-disposed when their origin frame gets navigated or the parent context gets
destroyed.

JSHandle instances can be used as an argument in [page.$eval()](), [page.evaluate()]() and [page.evaluateHandle()]()
methods.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method JSHandle.asElement
- returns: <[null]|[ElementHandle]>

Returns either `null` or the object handle itself, if the object handle is an instance of [ElementHandle].

#### method JSHandle.dispose
- returns: <[Promise]> Promise which resolves when the object handle is successfully disposed.

The `jsHandle.dispose` method stops referencing the element handle.

#### method JSHandle.evaluate
- `pageFunction` <[function]> Function to be evaluated in browser context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

This method passes this handle as the first argument to `pageFunction`.

If `pageFunction` returns a [Promise], then `handle.evaluate` would wait for the promise to resolve and return its
value.

Examples:

```js
const tweetHandle = await page.$('.tweet .retweets');
expect(await tweetHandle.evaluate((node, suffix) => node.innerText, ' retweets')).toBe('10 retweets');
```

#### method JSHandle.evaluateHandle
- `pageFunction` <[function]|[string]> Function to be evaluated
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[JSHandle]>> Promise which resolves to the return value of `pageFunction` as in-page object (JSHandle)

This method passes this handle as the first argument to `pageFunction`.

The only difference between `jsHandle.evaluate` and `jsHandle.evaluateHandle` is that `jsHandle.evaluateHandle` returns
in-page object (JSHandle).

If the function passed to the `jsHandle.evaluateHandle` returns a [Promise], then `jsHandle.evaluateHandle` would wait
for the promise to resolve and return its value.

See [page.evaluateHandle()]() for more details.

#### method JSHandle.getProperties
- returns: <[Promise]<[Map]<[string], [JSHandle]>>>

The method returns a map with **own property names** as keys and JSHandle instances for the property values.

```js
const handle = await page.evaluateHandle(() => ({window, document}));
const properties = await handle.getProperties();
const windowHandle = properties.get('window');
const documentHandle = properties.get('document');
await handle.dispose();
```

#### method JSHandle.getProperty
- `propertyName` <[string]> property to get
- returns: <[Promise]<[JSHandle]>>

Fetches a single property from the referenced object.

#### method JSHandle.jsonValue
- returns: <[Promise]<[Serializable]>>

Returns a JSON representation of the object. If the object has a
[`toJSON`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#toJSON()_behavior)
function, it **will not be called**.

> **NOTE** The method will return an empty JSON object if the referenced object is not stringifiable. It will throw an
error if the object has circular references.

### class: ConsoleMessage

[ConsoleMessage] objects are dispatched by page via the [page.on('console')]() event.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method ConsoleMessage.args
- returns: <[Array]<[JSHandle]>>

#### method ConsoleMessage.location
- returns: <[Object]>
  - `url` <[string]> URL of the resource if available, otherwise empty string.
  - `lineNumber` <[number]> 0-based line number in the resource.
  - `columnNumber` <[number]> 0-based column number in the resource.

#### method ConsoleMessage.text
- returns: <[string]>

#### method ConsoleMessage.type
- returns: <[string]>

One of the following values: `'log'`, `'debug'`, `'info'`, `'error'`, `'warning'`, `'dir'`, `'dirxml'`, `'table'`,
`'trace'`, `'clear'`, `'startGroup'`, `'startGroupCollapsed'`, `'endGroup'`, `'assert'`, `'profile'`, `'profileEnd'`,
`'count'`, `'timeEnd'`.

### class: Dialog

[Dialog] objects are dispatched by page via the [page.on('dialog')]() event.

An example of using `Dialog` class:

```js
const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  page.on('dialog', async dialog => {
    console.log(dialog.message());
    await dialog.dismiss();
    await browser.close();
  });
  page.evaluate(() => alert('1'));
})();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Dialog.accept
- `promptText` <[string]> A text to enter in prompt. Does not cause any effects if the dialog's `type` is not prompt. Optional.
- returns: <[Promise]> Promise which resolves when the dialog has been accepted.

#### method Dialog.defaultValue
- returns: <[string]> If dialog is prompt, returns default prompt value. Otherwise, returns empty string.

#### method Dialog.dismiss
- returns: <[Promise]> Promise which resolves when the dialog has been dismissed.

#### method Dialog.message
- returns: <[string]> A message displayed in the dialog.

#### method Dialog.type
- returns: <[string]> Dialog's type, can be one of `alert`, `beforeunload`, `confirm` or `prompt`.

### class: Download

[Download] objects are dispatched by page via the [page.on('download')]() event.

All the downloaded files belonging to the browser context are deleted when the browser context is closed. All downloaded
files are deleted when the browser closes.

Download event is emitted once the download starts. Download path becomes available once download completes:

```js
const [ download ] = await Promise.all([
  page.waitForEvent('download'), // wait for download to start
  page.click('a')
]);
// wait for download to complete
const path = await download.path();
...
```

> **NOTE** Browser context **must** be created with the `acceptDownloads` set to `true` when user needs access to the
downloaded content. If `acceptDownloads` is not set or set to `false`, download events are emitted, but the actual
download is not performed and user has no access to the downloaded files.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Download.createReadStream
- returns: <[Promise]<[null]|[Readable]>>

Returns readable stream for current download or `null` if download failed.

#### method Download.delete
- returns: <[Promise]>

Deletes the downloaded file.

#### method Download.failure
- returns: <[Promise]<[null]|[string]>>

Returns download error if any.

#### method Download.path
- returns: <[Promise]<[null]|[string]>>

Returns path to the downloaded file in case of successful download.

#### method Download.saveAs
- `path` <[string]> Path where the download should be saved.
- returns: <[Promise]>

Saves the download to a user-specified path.

#### method Download.suggestedFilename
- returns: <[string]>

Returns suggested filename for this download. It is typically computed by the browser from the
[`Content-Disposition`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition) response header
or the `download` attribute. See the spec on [whatwg](https://html.spec.whatwg.org/#downloading-resources). Different
browsers can use different logic for computing it.

#### method Download.url
- returns: <[string]>

Returns downloaded url.

### class: Video

When browser context is created with the `videosPath` option, each page has a video object associated with it.

```js
console.log(await page.video().path());
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Video.path
- returns: <[Promise]<[string]>>

Returns the file system path this video will be recorded to. The video is guaranteed to be written to the filesystem
upon closing the browser context.

### class: FileChooser

[FileChooser] objects are dispatched by the page in the [page.on('filechooser')]() event.

```js
page.on('filechooser', async (fileChooser) => {
  await fileChooser.setFiles('/tmp/myfile.pdf');
});
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method FileChooser.element
- returns: <[ElementHandle]>

Returns input element associated with this file chooser.

#### method FileChooser.isMultiple
- returns: <[boolean]>

Returns whether this file chooser accepts multiple files.

#### method FileChooser.page
- returns: <[Page]>

Returns page this file chooser belongs to.

#### method FileChooser.setFiles
- %%-input-files-%%
- `options` <[Object]>
  - %%-input-no-wait-after-%%
  - %%-input-timeout-%%
- returns: <[Promise]>

Sets the value of the file input this chooser is associated with. If some of the `filePaths` are relative paths, then
they are resolved relative to the [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
For empty array, clears the selected files.

### class: Keyboard

Keyboard provides an api for managing a virtual keyboard. The high level api is [keyboard.type()](), which takes raw
characters and generates proper keydown, keypress/input, and keyup events on your page.

For finer control, you can use [keyboard.down()](), [keyboard.up()](), and [keyboard.insertText()]() to manually fire
events as if they were generated from a real keyboard.

An example of holding down `Shift` in order to select and delete some text:

```js
await page.keyboard.type('Hello World!');
await page.keyboard.press('ArrowLeft');

await page.keyboard.down('Shift');
for (let i = 0; i < ' World'.length; i++)
  await page.keyboard.press('ArrowLeft');
await page.keyboard.up('Shift');

await page.keyboard.press('Backspace');
// Result text will end up saying 'Hello!'
```

An example of pressing uppercase `A`

```js
await page.keyboard.press('Shift+KeyA');
// or
await page.keyboard.press('Shift+A');
```

An example to trigger select-all with the keyboard

```js
// on Windows and Linux
await page.keyboard.press('Control+A');
// on macOS
await page.keyboard.press('Meta+A');
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Keyboard.down
- `key` <[string]> Name of the key to press or a character to generate, such as `ArrowLeft` or `a`.
- returns: <[Promise]>

Dispatches a `keydown` event.

`key` can specify the intended [keyboardEvent.key](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key)
value or a single character to generate the text for. A superset of the `key` values can be found
[here](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values). Examples of the keys are:

`F1` - `F12`, `Digit0`- `Digit9`, `KeyA`- `KeyZ`, `Backquote`, `Minus`, `Equal`, `Backslash`, `Backspace`, `Tab`,
`Delete`, `Escape`, `ArrowDown`, `End`, `Enter`, `Home`, `Insert`, `PageDown`, `PageUp`, `ArrowRight`, `ArrowUp`, etc.

Following modification shortcuts are also suported: `Shift`, `Control`, `Alt`, `Meta`, `ShiftLeft`.

Holding down `Shift` will type the text that corresponds to the `key` in the upper case.

If `key` is a single character, it is case-sensitive, so the values `a` and `A` will generate different respective
texts.

If `key` is a modifier key, `Shift`, `Meta`, `Control`, or `Alt`, subsequent key presses will be sent with that modifier
active. To release the modifier key, use [keyboard.up()]().

After the key is pressed once, subsequent calls to [keyboard.down()]() will have
[repeat](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/repeat) set to true. To release the key, use
[keyboard.up()]().

> **NOTE** Modifier keys DO influence `keyboard.down`. Holding down `Shift` will type the text in upper case.

#### method Keyboard.insertText
- `text` <[string]> Sets input to the specified text value.
- returns: <[Promise]>

Dispatches only `input` event, does not emit the `keydown`, `keyup` or `keypress` events.

```js
page.keyboard.insertText('嗨');
```

> **NOTE** Modifier keys DO NOT effect `keyboard.insertText`. Holding down `Shift` will not type the text in upper case.

#### method Keyboard.press
- `key` <[string]> Name of the key to press or a character to generate, such as `ArrowLeft` or `a`.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between `keydown` and `keyup` in milliseconds. Defaults to 0.
- returns: <[Promise]>

`key` can specify the intended [keyboardEvent.key](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key)
value or a single character to generate the text for. A superset of the `key` values can be found
[here](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key/Key_Values). Examples of the keys are:

`F1` - `F12`, `Digit0`- `Digit9`, `KeyA`- `KeyZ`, `Backquote`, `Minus`, `Equal`, `Backslash`, `Backspace`, `Tab`,
`Delete`, `Escape`, `ArrowDown`, `End`, `Enter`, `Home`, `Insert`, `PageDown`, `PageUp`, `ArrowRight`, `ArrowUp`, etc.

Following modification shortcuts are also suported: `Shift`, `Control`, `Alt`, `Meta`, `ShiftLeft`.

Holding down `Shift` will type the text that corresponds to the `key` in the upper case.

If `key` is a single character, it is case-sensitive, so the values `a` and `A` will generate different respective
texts.

Shortcuts such as `key: "Control+o"` or `key: "Control+Shift+T"` are supported as well. When speficied with the
modifier, modifier is pressed and being held while the subsequent key is being pressed.

```js
const page = await browser.newPage();
await page.goto('https://keycode.info');
await page.keyboard.press('A');
await page.screenshot({ path: 'A.png' });
await page.keyboard.press('ArrowLeft');
await page.screenshot({ path: 'ArrowLeft.png' });
await page.keyboard.press('Shift+O');
await page.screenshot({ path: 'O.png' });
await browser.close();
```

Shortcut for [keyboard.down()]() and [keyboard.up()]().

#### method Keyboard.type
- `text` <[string]> A text to type into a focused element.
- `options` <[Object]>
  - `delay` <[number]> Time to wait between key presses in milliseconds. Defaults to 0.
- returns: <[Promise]>

Sends a `keydown`, `keypress`/`input`, and `keyup` event for each character in the text.

To press a special key, like `Control` or `ArrowDown`, use [keyboard.press()]().

```js
await page.keyboard.type('Hello'); // Types instantly
await page.keyboard.type('World', {delay: 100}); // Types slower, like a user
```

> **NOTE** Modifier keys DO NOT effect `keyboard.type`. Holding down `Shift` will not type the text in upper case.

#### method Keyboard.up
- `key` <[string]> Name of the key to press or a character to generate, such as `ArrowLeft` or `a`.
- returns: <[Promise]>

Dispatches a `keyup` event.

### class: Mouse

The Mouse class operates in main-frame CSS pixels relative to the top-left corner of the viewport.

Every `page` object has its own Mouse, accessible with [page.mouse](#pagemouse).

```js
// Using ‘page.mouse’ to trace a 100x100 square.
await page.mouse.move(0, 0);
await page.mouse.down();
await page.mouse.move(0, 100);
await page.mouse.move(100, 100);
await page.mouse.move(100, 0);
await page.mouse.move(0, 0);
await page.mouse.up();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Mouse.click
- `x` <[number]>
- `y` <[number]>
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-click-count-%%
  - %%-input-down-up-delay-%%
- returns: <[Promise]>

Shortcut for [mouse.move()](), [mouse.down()](), [mouse.up()]().

#### method Mouse.dblclick
- `x` <[number]>
- `y` <[number]>
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-down-up-delay-%%
- returns: <[Promise]>

Shortcut for [mouse.move()](), [mouse.down()](), [mouse.up()](), [mouse.down()]() and [mouse.up()]().

#### method Mouse.down
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-click-count-%%
- returns: <[Promise]>

Dispatches a `mousedown` event.

#### method Mouse.move
- `x` <[number]>
- `y` <[number]>
- `options` <[Object]>
  - `steps` <[number]> defaults to 1. Sends intermediate `mousemove` events.
- returns: <[Promise]>

Dispatches a `mousemove` event.

#### method Mouse.up
- `options` <[Object]>
  - %%-input-button-%%
  - %%-input-click-count-%%
- returns: <[Promise]>

Dispatches a `mouseup` event.

### class: Touchscreen

The Touchscreen class operates in main-frame CSS pixels relative to the top-left corner of the viewport. Methods on the
touchscreen can only be used in browser contexts that have been intialized with `hasTouch` set to true.

#### method Touchscreen.tap
- `x` <[number]>
- `y` <[number]>
- returns: <[Promise]>

Dispatches a `touchstart` and `touchend` event with a single touch at the position (`x`,`y`).

### class: Request

Whenever the page sends a request for a network resource the following sequence of events are emitted by [Page]:
- [page.on('request')]() emitted when the request is issued by the page.
- [page.on('response')]() emitted when/if the response status and headers are received for the request.
- [page.on('requestfinished')]() emitted when the response body is downloaded and the request is complete.

If request fails at some point, then instead of `'requestfinished'` event (and possibly instead of 'response' event),
the  [page.on('requestfailed')]() event is emitted.

> **NOTE** HTTP Error responses, such as 404 or 503, are still successful responses from HTTP standpoint, so request
will complete with `'requestfinished'` event.

If request gets a 'redirect' response, the request is successfully finished with the 'requestfinished' event, and a new
request is  issued to a redirected url.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Request.failure
- returns: <[null]|[Object]> Object describing request failure, if any
  - `errorText` <[string]> Human-readable error message, e.g. `'net::ERR_FAILED'`.

The method returns `null` unless this request has failed, as reported by `requestfailed` event.

Example of logging of all the failed requests:

```js
page.on('requestfailed', request => {
  console.log(request.url() + ' ' + request.failure().errorText);
});
```

#### method Request.frame
- returns: <[Frame]> A [Frame] that initiated this request.

#### method Request.headers
- returns: <[Object]<[string], [string]>> An object with HTTP headers associated with the request. All header names are lower-case.

#### method Request.isNavigationRequest
- returns: <[boolean]>

Whether this request is driving frame's navigation.

#### method Request.method
- returns: <[string]> Request's method (GET, POST, etc.)

#### method Request.postData
- returns: <[null]|[string]> Request's post body, if any.

#### method Request.postDataBuffer
- returns: <[null]|[Buffer]> Request's post body in a binary form, if any.

#### method Request.postDataJSON
- returns: <[null]|[Object]> Parsed request's body for `form-urlencoded` and JSON as a fallback if any.

When the response is `application/x-www-form-urlencoded` then a key/value object of the values will be returned.
Otherwise it will be parsed as JSON.

#### method Request.redirectedFrom
- returns: <[null]|[Request]> Request that was redirected by the server to this one, if any.

When the server responds with a redirect, Playwright creates a new [Request] object. The two requests are connected by
`redirectedFrom()` and `redirectedTo()` methods. When multiple server redirects has happened, it is possible to
construct the whole redirect chain by repeatedly calling `redirectedFrom()`.

For example, if the website `http://example.com` redirects to `https://example.com`:

```js
const response = await page.goto('http://example.com');
console.log(response.request().redirectedFrom().url()); // 'http://example.com'
```

If the website `https://google.com` has no redirects:

```js
const response = await page.goto('https://google.com');
console.log(response.request().redirectedFrom()); // null
```

#### method Request.redirectedTo
- returns: <[null]|[Request]> New request issued by the browser if the server responded with redirect.

This method is the opposite of [request.redirectedFrom()]():

```js
console.log(request.redirectedFrom().redirectedTo() === request); // true
```

#### method Request.resourceType
- returns: <[string]>

Contains the request's resource type as it was perceived by the rendering engine. ResourceType will be one of the
following: `document`, `stylesheet`, `image`, `media`, `font`, `script`, `texttrack`, `xhr`, `fetch`, `eventsource`,
`websocket`, `manifest`, `other`.

#### method Request.response
- returns: <[Promise]<[null]|[Response]>> A matching [Response] object, or `null` if the response was not received due to error.

#### method Request.timing
- returns: <[Object]>
  - `startTime` <[number]> Request start time in milliseconds elapsed since January 1, 1970 00:00:00 UTC
  - `domainLookupStart` <[number]> Time immediately before the browser starts the domain name lookup for the resource. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `domainLookupEnd` <[number]> Time immediately after the browser starts the domain name lookup for the resource. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `connectStart` <[number]> Time immediately before the user agent starts establishing the connection to the server to retrieve the resource. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `secureConnectionStart` <[number]> Time immediately before the browser starts the handshake process to secure the current connection. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `connectEnd` <[number]> Time immediately before the user agent starts establishing the connection to the server to retrieve the resource. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `requestStart` <[number]> Time immediately before the browser starts requesting the resource from the server, cache, or local resource. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `responseStart` <[number]> Time immediately after the browser starts requesting the resource from the server, cache, or local resource. The value is given in milliseconds relative to `startTime`, -1 if not available.
  - `responseEnd` <[number]> Time immediately after the browser receives the last byte of the resource or immediately before the transport connection is closed, whichever comes first. The value is given in milliseconds relative to `startTime`, -1 if not available.

Returns resource timing information for given request. Most of the timing values become available upon the response,
`responseEnd` becomes available when request finishes. Find more information at [Resource Timing
API](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming).

```js
const [request] = await Promise.all([
  page.waitForEvent('requestfinished'),
  page.goto(httpsServer.EMPTY_PAGE)
]);
console.log(request.timing());
```

#### method Request.url
- returns: <[string]> URL of the request.

### class: Response

[Response] class represents responses which are received by page.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Response.body
- returns: <[Promise]<[Buffer]>> Promise which resolves to a buffer with response body.

#### method Response.finished
- returns: <[Promise]<[null]|[Error]>> Waits for this response to finish, returns failure error if request failed.

#### method Response.frame
- returns: <[Frame]> A [Frame] that initiated this response.

#### method Response.headers
- returns: <[Object]<[string], [string]>> An object with HTTP headers associated with the response. All header names are lower-case.

#### method Response.json
- returns: <[Promise]<[Serializable]>> Promise which resolves to a JSON representation of response body.

This method will throw if the response body is not parsable via `JSON.parse`.

#### method Response.ok
- returns: <[boolean]>

Contains a boolean stating whether the response was successful (status in the range 200-299) or not.

#### method Response.request
- returns: <[Request]> A matching [Request] object.

#### method Response.status
- returns: <[number]>

Contains the status code of the response (e.g., 200 for a success).

#### method Response.statusText
- returns: <[string]>

Contains the status text of the response (e.g. usually an "OK" for a success).

#### method Response.text
- returns: <[Promise]<[string]>> Promise which resolves to a text representation of response body.

#### method Response.url
- returns: <[string]>

Contains the URL of the response.

### class: Selectors

Selectors can be used to install custom selector engines. See [Working with selectors](#working-with-selectors) for more
information.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Selectors.register
- `name` <[string]> Name that is used in selectors as a prefix, e.g. `{name: 'foo'}` enables `foo=myselectorbody` selectors. May only contain `[a-zA-Z0-9_]` characters.
- `script` <[function]|[string]|[Object]> Script that evaluates to a selector engine instance.
  - `path` <[string]> Path to the JavaScript file. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
  - `content` <[string]> Raw script content.
- `options` <[Object]>
  - `contentScript` <[boolean]> Whether to run this selector engine in isolated JavaScript environment. This environment has access to the same DOM, but not any JavaScript objects from the frame's scripts. Defaults to `false`. Note that running as a content script is not guaranteed when this engine is used together with other registered engines.
- returns: <[Promise]>

An example of registering selector engine that queries elements based on a tag name:

```js
const { selectors, firefox } = require('playwright');  // Or 'chromium' or 'webkit'.

(async () => {
  // Must be a function that evaluates to a selector engine instance.
  const createTagNameEngine = () => ({
    // Creates a selector that matches given target when queried at the root.
    // Can return undefined if unable to create one.
    create(root, target) {
      return root.querySelector(target.tagName) === target ? target.tagName : undefined;
    },

    // Returns the first element matching given selector in the root's subtree.
    query(root, selector) {
      return root.querySelector(selector);
    },

    // Returns all elements matching given selector in the root's subtree.
    queryAll(root, selector) {
      return Array.from(root.querySelectorAll(selector));
    }
  });

  // Register the engine. Selectors will be prefixed with "tag=".
  await selectors.register('tag', createTagNameEngine);

  const browser = await firefox.launch();
  const page = await browser.newPage();
  await page.setContent(`<div><button>Click me</button></div>`);

  // Use the selector prefixed with its name.
  const button = await page.$('tag=button');
  // Combine it with other selector engines.
  await page.click('tag=div >> text="Click me"');
  // Can use it in any methods supporting selectors.
  const buttonCount = await page.$$eval('tag=button', buttons => buttons.length);

  await browser.close();
})();
```

### class: Route

Whenever a network route is set up with [page.route()]() or [browserContext.route()](), the `Route` object allows to
handle the route.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Route.abort
- `errorCode` <[string]> Optional error code. Defaults to `failed`, could be one of the following:
  - `'aborted'` - An operation was aborted (due to user action)
  - `'accessdenied'` - Permission to access a resource, other than the network, was denied
  - `'addressunreachable'` - The IP address is unreachable. This usually means that there is no route to the specified host or network.
  - `'blockedbyclient'` - The client chose to block the request.
  - `'blockedbyresponse'` - The request failed because the response was delivered along with requirements which are not met ('X-Frame-Options' and 'Content-Security-Policy' ancestor checks, for instance).
  - `'connectionaborted'` - A connection timed out as a result of not receiving an ACK for data sent.
  - `'connectionclosed'` - A connection was closed (corresponding to a TCP FIN).
  - `'connectionfailed'` - A connection attempt failed.
  - `'connectionrefused'` - A connection attempt was refused.
  - `'connectionreset'` - A connection was reset (corresponding to a TCP RST).
  - `'internetdisconnected'` - The Internet connection has been lost.
  - `'namenotresolved'` - The host name could not be resolved.
  - `'timedout'` - An operation timed out.
  - `'failed'` - A generic failure occurred.
- returns: <[Promise]>

Aborts the route's request.

#### method Route.continue
- `overrides` <[Object]> Optional request overrides, can override following properties:
  - `url` <[string]> If set changes the request URL. New URL must have same protocol as original one.
  - `method` <[string]> If set changes the request method (e.g. GET or POST)
  - `postData` <[string]|[Buffer]> If set changes the post data of request
  - `headers` <[Object]<[string], [string]>> If set changes the request HTTP headers. Header values will be converted to a string.
- returns: <[Promise]>

Continues route's request with optional overrides.

```js
await page.route('**/*', (route, request) => {
  // Override headers
  const headers = {
    ...request.headers(),
    foo: 'bar', // set "foo" header
    origin: undefined, // remove "origin" header
  };
  route.continue({headers});
});
```

#### method Route.fulfill
- `response` <[Object]> Response that will fulfill this route's request.
  - `status` <[number]> Response status code, defaults to `200`.
  - `headers` <[Object]<[string], [string]>> Optional response headers. Header values will be converted to a string.
  - `contentType` <[string]> If set, equals to setting `Content-Type` response header.
  - `body` <[string]|[Buffer]> Optional response body.
  - `path` <[string]> Optional file path to respond with. The content type will be inferred from file extension. If `path` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd).
- returns: <[Promise]>

Fulfills route's request with given response.

An example of fulfilling all requests with 404 responses:

```js
await page.route('**/*', route => {
  route.fulfill({
    status: 404,
    contentType: 'text/plain',
    body: 'Not Found!'
  });
});
```

An example of serving static file:

```js
await page.route('**/xhr_endpoint', route => route.fulfill({ path: 'mock_data.json' }));
```

#### method Route.request
- returns: <[Request]> A request to be routed.

### class: WebSocket

The [WebSocket] class represents websocket connections in the page.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### event WebSocket.close

Fired when the websocket closes.

#### event WebSocket.framereceived
- <[Object]> web socket frame data
  - `payload` <[string]|[Buffer]> frame payload

Fired when the websocket recieves a frame.

#### event WebSocket.framesent
- <[Object]> web socket frame data
  - `payload` <[string]|[Buffer]> frame payload

Fired when the websocket sends a frame.

#### event WebSocket.socketerror
- <[String]> the error message

Fired when the websocket has an error.

#### method WebSocket.isClosed
- returns: <[boolean]>

Indicates that the web socket has been closed.

#### method WebSocket.url
- returns: <[string]>

Contains the URL of the WebSocket.

#### method WebSocket.waitForEvent
- `event` <[string]> Event name, same one would pass into `webSocket.on(event)`.
- `optionsOrPredicate` <[Function]|[Object]> Either a predicate that receives an event or an options object. Optional.
  - `predicate` <[Function]> receives the event data and resolves to truthy value when the waiting should resolve.
  - %%-wait-for-timeout-%%
- returns: <[Promise]<[Object]>> Promise which resolves to the event data value.

Waits for event to fire and passes its value into the predicate function. Resolves when the predicate returns truthy
value. Will throw an error if the webSocket is closed before the event is fired.

### class: TimeoutError
* extends: [Error]

TimeoutError is emitted whenever certain operations are terminated due to timeout, e.g. [page.waitForSelector()]() or
[browserType.launch()]().

### class: Accessibility

The Accessibility class provides methods for inspecting Chromium's accessibility tree. The accessibility tree is used by
assistive technology such as [screen readers](https://en.wikipedia.org/wiki/Screen_reader) or
[switches](https://en.wikipedia.org/wiki/Switch_access).

Accessibility is a very platform-specific thing. On different platforms, there are different screen readers that might
have wildly different output.

Blink - Chromium's rendering engine - has a concept of "accessibility tree", which is then translated into different
platform-specific APIs. Accessibility namespace gives users access to the Blink Accessibility Tree.

Most of the accessibility tree gets filtered out when converting from Blink AX Tree to Platform-specific AX-Tree or by
assistive technologies themselves. By default, Playwright tries to approximate this filtering, exposing only the
"interesting" nodes of the tree.

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Accessibility.snapshot
- `options` <[Object]>
  - `interestingOnly` <[boolean]> Prune uninteresting nodes from the tree. Defaults to `true`.
  - `root` <[ElementHandle]> The root DOM element for the snapshot. Defaults to the whole page.
- returns: <[Promise]<[null]|[Object]>> An [AXNode] object with the following properties:
  - `role` <[string]> The [role](https://www.w3.org/TR/wai-aria/#usage_intro).
  - `name` <[string]> A human readable name for the node.
  - `value` <[string]|[number]> The current value of the node, if applicable.
  - `description` <[string]> An additional human readable description of the node, if applicable.
  - `keyshortcuts` <[string]> Keyboard shortcuts associated with this node, if applicable.
  - `roledescription` <[string]> A human readable alternative to the role, if applicable.
  - `valuetext` <[string]> A description of the current value, if applicable.
  - `disabled` <[boolean]> Whether the node is disabled, if applicable.
  - `expanded` <[boolean]> Whether the node is expanded or collapsed, if applicable.
  - `focused` <[boolean]> Whether the node is focused, if applicable.
  - `modal` <[boolean]> Whether the node is [modal](https://en.wikipedia.org/wiki/Modal_window), if applicable.
  - `multiline` <[boolean]> Whether the node text input supports multiline, if applicable.
  - `multiselectable` <[boolean]> Whether more than one child can be selected, if applicable.
  - `readonly` <[boolean]> Whether the node is read only, if applicable.
  - `required` <[boolean]> Whether the node is required, if applicable.
  - `selected` <[boolean]> Whether the node is selected in its parent node, if applicable.
  - `checked` <[boolean]|"mixed"> Whether the checkbox is checked, or "mixed", if applicable.
  - `pressed` <[boolean]|"mixed"> Whether the toggle button is checked, or "mixed", if applicable.
  - `level` <[number]> The level of a heading, if applicable.
  - `valuemin` <[number]> The minimum value in a node, if applicable.
  - `valuemax` <[number]> The maximum value in a node, if applicable.
  - `autocomplete` <[string]> What kind of autocomplete is supported by a control, if applicable.
  - `haspopup` <[string]> What kind of popup is currently being shown for a node, if applicable.
  - `invalid` <[string]> Whether and in what way this node's value is invalid, if applicable.
  - `orientation` <[string]> Whether the node is oriented horizontally or vertically, if applicable.
  - `children` <[Array]<[Object]>> Child [AXNode]s of this node, if any, if applicable.

Captures the current state of the accessibility tree. The returned object represents the root accessible node of the
page.

> **NOTE** The Chromium accessibility tree contains nodes that go unused on most platforms and by most screen readers.
Playwright will discard them as well for an easier to process tree, unless `interestingOnly` is set to `false`.

An example of dumping the entire accessibility tree:

```js
const snapshot = await page.accessibility.snapshot();
console.log(snapshot);
```

An example of logging the focused node's name:

```js
const snapshot = await page.accessibility.snapshot();
const node = findFocusedNode(snapshot);
console.log(node && node.name);

function findFocusedNode(node) {
  if (node.focused)
    return node;
  for (const child of node.children || []) {
    const foundNode = findFocusedNode(child);
    return foundNode;
  }
  return null;
}
```

### class: Worker

The Worker class represents a [WebWorker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API). `worker`
event is emitted on the page object to signal a worker creation. `close` event is emitted on the worker object when the
worker is gone.

```js
page.on('worker', worker => {
  console.log('Worker created: ' + worker.url());
  worker.on('close', worker => console.log('Worker destroyed: ' + worker.url()));
});

console.log('Current workers:');
for (const worker of page.workers())
  console.log('  ' + worker.url());
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### event Worker.close
- <[Worker]>

Emitted when this dedicated [WebWorker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API) is terminated.

#### method Worker.evaluate
- `pageFunction` <[function]|[string]> Function to be evaluated in the worker context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[Serializable]>> Promise which resolves to the return value of `pageFunction`

If the function passed to the `worker.evaluate` returns a [Promise], then `worker.evaluate` would wait for the promise
to resolve and return its value.

If the function passed to the `worker.evaluate` returns a non-[Serializable] value, then `worker.evaluate` resolves to
`undefined`. DevTools Protocol also supports transferring some additional values that are not serializable by `JSON`:
`-0`, `NaN`, `Infinity`, `-Infinity`, and bigint literals.

#### method Worker.evaluateHandle
- `pageFunction` <[function]|[string]> Function to be evaluated in the page context
- `arg` <[EvaluationArgument]> Optional argument to pass to `pageFunction`
- returns: <[Promise]<[JSHandle]>> Promise which resolves to the return value of `pageFunction` as in-page object (JSHandle)

The only difference between `worker.evaluate` and `worker.evaluateHandle` is that `worker.evaluateHandle` returns
in-page object (JSHandle).

If the function passed to the `worker.evaluateHandle` returns a [Promise], then `worker.evaluateHandle` would wait for
the promise to resolve and return its value.

#### method Worker.url
- returns: <[string]>

### class: BrowserServer

<!-- GEN:toc -->
<!-- GEN:stop -->

#### event BrowserServer.close

Emitted when the browser server closes.

#### method BrowserServer.close
- returns: <[Promise]>

Closes the browser gracefully and makes sure the process is terminated.

#### method BrowserServer.kill
- returns: <[Promise]>

Kills the browser process and waits for the process to exit.

#### method BrowserServer.process
- returns: <[ChildProcess]> Spawned browser application process.

#### method BrowserServer.wsEndpoint
- returns: <[string]> Browser websocket url.

Browser websocket endpoint which can be used as an argument to [browserType.connect()]() to establish connection to the
browser.

### class: BrowserType

BrowserType provides methods to launch a specific browser instance or connect to an existing one. The following is a
typical example of using Playwright to drive automation:

```js
const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.

(async () => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.goto('https://example.com');
  // other actions...
  await browser.close();
})();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method BrowserType.connect
- `params` <[Object]>
  - `wsEndpoint` <[string]> A browser websocket endpoint to connect to. **required**
  - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on. Defaults to 0.
  - `logger` <[Logger]> Logger sink for Playwright logging.
  - `timeout` <[number]> Maximum time in milliseconds to wait for the connection to be established. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
- returns: <[Promise]<[Browser]>>

This methods attaches Playwright to an existing browser instance.

#### method BrowserType.executablePath
- returns: <[string]> A path where Playwright expects to find a bundled browser executable.

#### method BrowserType.launch
- `options` <[Object]>
  - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
  - `executablePath` <[string]> Path to a browser executable to run instead of the bundled one. If `executablePath` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). Note that Playwright only works with the bundled Chromium, Firefox or WebKit, use at your own risk.
  - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, Playwright does not pass its own configurations args and only uses the ones from `args`. If an array is given, then filters out the given default arguments. Dangerous option; use with care. Defaults to `false`.
  - `proxy` <[Object]> Network proxy settings.
    - `server` <[string]> Proxy to be used for all requests. HTTP and SOCKS proxies are supported, for example `http://myproxy.com:3128` or `socks5://myproxy.com:3128`. Short form `myproxy.com:3128` is considered an HTTP proxy.
    - `bypass` <[string]> Optional coma-separated domains to bypass proxy, for example `".com, chromium.org, .domain.com"`.
    - `username` <[string]> Optional username to use if HTTP proxy requires authentication.
    - `password` <[string]> Optional password to use if HTTP proxy requires authentication.
  - `downloadsPath` <[string]> If specified, accepted downloads are downloaded into this directory. Otherwise, temporary directory is created and is deleted when browser is closed.
  - `chromiumSandbox` <[boolean]> Enable Chromium sandboxing. Defaults to `false`.
  - `firefoxUserPrefs` <[Object]<[string], [string]|[number]|[boolean]>> Firefox user preferences. Learn more about the Firefox user preferences at [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
  - `handleSIGINT` <[boolean]> Close the browser process on Ctrl-C. Defaults to `true`.
  - `handleSIGTERM` <[boolean]> Close the browser process on SIGTERM. Defaults to `true`.
  - `handleSIGHUP` <[boolean]> Close the browser process on SIGHUP. Defaults to `true`.
  - `logger` <[Logger]> Logger sink for Playwright logging.
  - `timeout` <[number]> Maximum time in milliseconds to wait for the browser instance to start. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
  - `env` <[Object]<[string], [string]|[number]|[boolean]>> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
  - `devtools` <[boolean]> **Chromium-only** Whether to auto-open a Developer Tools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
  - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
- returns: <[Promise]<[Browser]>> Promise which resolves to browser instance.

You can use `ignoreDefaultArgs` to filter out `--mute-audio` from default arguments:

```js
const browser = await chromium.launch({  // Or 'firefox' or 'webkit'.
  ignoreDefaultArgs: ['--mute-audio']
});
```

> **Chromium-only** Playwright can also be used to control the Chrome browser, but it works best with the version of
Chromium it is bundled with. There is no guarantee it will work with any other version. Use `executablePath` option with
extreme caution.
>
> If Google Chrome (rather than Chromium) is preferred, a [Chrome
Canary](https://www.google.com/chrome/browser/canary.html) or [Dev
Channel](https://www.chromium.org/getting-involved/dev-channel) build is suggested.
>
> In [browserType.launch()]() above, any mention of Chromium also applies to Chrome.
>
> See [`this article`](https://www.howtogeek.com/202825/what%E2%80%99s-the-difference-between-chromium-and-chrome/) for
a description of the differences between Chromium and Chrome. [`This
article`](https://chromium.googlesource.com/chromium/src/+/lkgr/docs/chromium_browser_vs_google_chrome.md) describes
some differences for Linux users.

#### method BrowserType.launchPersistentContext
- `userDataDir` <[string]> Path to a User Data Directory, which stores browser session data like cookies and local storage. More details for [Chromium](https://chromium.googlesource.com/chromium/src/+/master/docs/user_data_dir.md) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options#User_Profile).
- `options` <[Object]>
  - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
  - `executablePath` <[string]> Path to a browser executable to run instead of the bundled one. If `executablePath` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). **BEWARE**: Playwright is only guaranteed to work with the bundled Chromium, Firefox or WebKit, use at your own risk.
  - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, then do not use any of the default arguments. If an array is given, then filter out the given default arguments. Dangerous option; use with care. Defaults to `false`.
  - `proxy` <[Object]> Network proxy settings.
    - `server` <[string]> Proxy to be used for all requests. HTTP and SOCKS proxies are supported, for example `http://myproxy.com:3128` or `socks5://myproxy.com:3128`. Short form `myproxy.com:3128` is considered an HTTP proxy.
    - `bypass` <[string]> Optional coma-separated domains to bypass proxy, for example `".com, chromium.org, .domain.com"`.
    - `username` <[string]> Optional username to use if HTTP proxy requires authentication.
    - `password` <[string]> Optional password to use if HTTP proxy requires authentication.
  - `downloadsPath` <[string]> If specified, accepted downloads are downloaded into this directory. Otherwise, temporary directory is created and is deleted when browser is closed.
  - `chromiumSandbox` <[boolean]> Enable Chromium sandboxing. Defaults to `true`.
  - `handleSIGINT` <[boolean]> Close the browser process on Ctrl-C. Defaults to `true`.
  - `handleSIGTERM` <[boolean]> Close the browser process on SIGTERM. Defaults to `true`.
  - `handleSIGHUP` <[boolean]> Close the browser process on SIGHUP. Defaults to `true`.
  - `timeout` <[number]> Maximum time in milliseconds to wait for the browser instance to start. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
  - `env` <[Object]<[string], [string]|[number]|[boolean]>> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
  - `devtools` <[boolean]> **Chromium-only** Whether to auto-open a Developer Tools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
  - `slowMo` <[number]> Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on. Defaults to 0.
  - %%-shared-context-params-%%-as-is
- returns: <[Promise]<[BrowserContext]>> Promise that resolves to the persistent browser context instance.

Launches browser that uses persistent storage located at `userDataDir` and returns the only context. Closing this
context will automatically close the browser.

#### method BrowserType.launchServer
- `options` <[Object]>
  - `headless` <[boolean]> Whether to run browser in headless mode. More details for [Chromium](https://developers.google.com/web/updates/2017/04/headless-chrome) and [Firefox](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Headless_mode). Defaults to `true` unless the `devtools` option is `true`.
  - `port` <[number]> Port to use for the web socket. Defaults to 0 that picks any available port.
  - `executablePath` <[string]> Path to a browser executable to run instead of the bundled one. If `executablePath` is a relative path, then it is resolved relative to [current working directory](https://nodejs.org/api/process.html#process_process_cwd). **BEWARE**: Playwright is only guaranteed to work with the bundled Chromium, Firefox or WebKit, use at your own risk.
  - `args` <[Array]<[string]>> Additional arguments to pass to the browser instance. The list of Chromium flags can be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
  - `ignoreDefaultArgs` <[boolean]|[Array]<[string]>> If `true`, then do not use any of the default arguments. If an array is given, then filter out the given default arguments. Dangerous option; use with care. Defaults to `false`.
  - `proxy` <[Object]> Network proxy settings.
    - `server` <[string]> Proxy to be used for all requests. HTTP and SOCKS proxies are supported, for example `http://myproxy.com:3128` or `socks5://myproxy.com:3128`. Short form `myproxy.com:3128` is considered an HTTP proxy.
    - `bypass` <[string]> Optional coma-separated domains to bypass proxy, for example `".com, chromium.org, .domain.com"`.
    - `username` <[string]> Optional username to use if HTTP proxy requires authentication.
    - `password` <[string]> Optional password to use if HTTP proxy requires authentication.
  - `downloadsPath` <[string]> If specified, accepted downloads are downloaded into this directory. Otherwise, temporary directory is created and is deleted when browser is closed.
  - `chromiumSandbox` <[boolean]> Enable Chromium sandboxing. Defaults to `true`.
  - `firefoxUserPrefs` <[Object]<[string], [string]|[number]|[boolean]>> Firefox user preferences. Learn more about the Firefox user preferences at [`about:config`](https://support.mozilla.org/en-US/kb/about-config-editor-firefox).
  - `handleSIGINT` <[boolean]> Close the browser process on Ctrl-C. Defaults to `true`.
  - `handleSIGTERM` <[boolean]> Close the browser process on SIGTERM. Defaults to `true`.
  - `handleSIGHUP` <[boolean]> Close the browser process on SIGHUP. Defaults to `true`.
  - `logger` <[Logger]> Logger sink for Playwright logging.
  - `timeout` <[number]> Maximum time in milliseconds to wait for the browser instance to start. Defaults to `30000` (30 seconds). Pass `0` to disable timeout.
  - `env` <[Object]<[string], [string]|[number]|[boolean]>> Specify environment variables that will be visible to the browser. Defaults to `process.env`.
  - `devtools` <[boolean]> **Chromium-only** Whether to auto-open a Developer Tools panel for each tab. If this option is `true`, the `headless` option will be set `false`.
- returns: <[Promise]<[BrowserServer]>> Promise which resolves to the browser app instance.

Launches browser server that client can connect to. An example of launching a browser executable and connecting to it
later:

```js
const { chromium } = require('playwright');  // Or 'webkit' or 'firefox'.

(async () => {
  const browserServer = await chromium.launchServer();
  const wsEndpoint = browserServer.wsEndpoint();
  // Use web socket endpoint later to establish a connection.
  const browser = await chromium.connect({ wsEndpoint });
  // Close browser instance.
  await browserServer.close();
})();
```

#### method BrowserType.name
- returns: <[string]>

Returns browser name. For example: `'chromium'`, `'webkit'` or `'firefox'`.

### class: Logger

Playwright generates a lot of logs and they are accessible via the pluggable logger sink.

```js
const { chromium } = require('playwright');  // Or 'firefox' or 'webkit'.

(async () => {
  const browser = await chromium.launch({
    logger: {
      isEnabled: (name, severity) => name === 'browser',
      log: (name, severity, message, args) => console.log(`${name} ${message}`)
    }
  });
  ...
})();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method Logger.isEnabled
- `name` <[string]> logger name
- `severity` <"verbose"|"info"|"warning"|"error">
- returns: <[boolean]>

Determines whether sink is interested in the logger with the given name and severity.

#### method Logger.log
- `name` <[string]> logger name
- `severity` <"verbose"|"info"|"warning"|"error">
- `message` <[string]|[Error]> log message format
- `args` <[Array]<[Object]>> message arguments
- `hints` <[Object]> optional formatting hints
  - `color` <[string]> preferred logger color

### class: ChromiumBrowser
* extends: [Browser]

Chromium-specific features including Tracing, service worker support, etc. You can use
[chromiumBrowser.startTracing()]() and [chromiumBrowser.stopTracing()]() to create a trace file which can be opened in
Chrome DevTools or [timeline viewer](https://chromedevtools.github.io/timeline-viewer/).

```js
await browser.startTracing(page, {path: 'trace.json'});
await page.goto('https://www.google.com');
await browser.stopTracing();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

<!-- GEN:toc-extends-Browser -->
<!-- GEN:stop -->

#### method ChromiumBrowser.newBrowserCDPSession
- returns: <[Promise]<[CDPSession]>> Promise that resolves to the newly created browser session.

#### method ChromiumBrowser.startTracing
- `page` <[Page]> Optional, if specified, tracing includes screenshots of the given page.
- `options` <[Object]>
  - `path` <[string]> A path to write the trace file to.
  - `screenshots` <[boolean]> captures screenshots in the trace.
  - `categories` <[Array]<[string]>> specify custom categories to use instead of default.
- returns: <[Promise]>

Only one trace can be active at a time per browser.

#### method ChromiumBrowser.stopTracing
- returns: <[Promise]<[Buffer]>> Promise which resolves to buffer with trace data.

### class: ChromiumBrowserContext
* extends: [BrowserContext]

Chromium-specific features including background pages, service worker support, etc.

```js
const backgroundPage = await context.waitForEvent('backgroundpage');
```

<!-- GEN:toc -->
<!-- GEN:stop -->

<!-- GEN:toc-extends-BrowserContext -->
<!-- GEN:stop -->

#### event ChromiumBrowserContext.backgroundpage
- <[Page]>

Emitted when new background page is created in the context.

> **NOTE** Only works with persistent context.

#### event ChromiumBrowserContext.serviceworker
- <[Worker]>

Emitted when new service worker is created in the context.

#### method ChromiumBrowserContext.backgroundPages
- returns: <[Array]<[Page]>> All existing background pages in the context.

#### method ChromiumBrowserContext.newCDPSession
- `page` <[Page]> Page to create new session for.
- returns: <[Promise]<[CDPSession]>> Promise that resolves to the newly created session.

#### method ChromiumBrowserContext.serviceWorkers
- returns: <[Array]<[Worker]>> All existing service workers in the context.

### class: ChromiumCoverage

Coverage gathers information about parts of JavaScript and CSS that were used by the page.

An example of using JavaScript coverage to produce Istambul report for page load:

```js
const { chromium } = require('playwright');
const v8toIstanbul = require('v8-to-istanbul');

(async() => {
  const browser = await chromium.launch();
  const page = await browser.newPage();
  await page.coverage.startJSCoverage();
  await page.goto('https://chromium.org');
  const coverage = await page.coverage.stopJSCoverage();
  for (const entry of coverage) {
    const converter = new v8toIstanbul('', 0, { source: entry.source });
    await converter.load();
    converter.applyCoverage(entry.functions);
    console.log(JSON.stringify(converter.toIstanbul()));
  }
  await browser.close();
})();
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method ChromiumCoverage.startCSSCoverage
- `options` <[Object]>
  - `resetOnNavigation` <[boolean]> Whether to reset coverage on every navigation. Defaults to `true`.
- returns: <[Promise]> Promise that resolves when coverage is started

#### method ChromiumCoverage.startJSCoverage
- `options` <[Object]>
  - `resetOnNavigation` <[boolean]> Whether to reset coverage on every navigation. Defaults to `true`.
  - `reportAnonymousScripts` <[boolean]> Whether anonymous scripts generated by the page should be reported. Defaults to `false`.
- returns: <[Promise]> Promise that resolves when coverage is started

> **NOTE** Anonymous scripts are ones that don't have an associated url. These are scripts that are dynamically created
on the page using `eval` or `new Function`. If `reportAnonymousScripts` is set to `true`, anonymous scripts will have
`__playwright_evaluation_script__` as their URL.

#### method ChromiumCoverage.stopCSSCoverage
- returns: <[Promise]<[Array]<[Object]>>> Promise that resolves to the array of coverage reports for all stylesheets
  - `url` <[string]> StyleSheet URL
  - `text` <[string]> StyleSheet content, if available.
  - `ranges` <[Array]<[Object]>> StyleSheet ranges that were used. Ranges are sorted and non-overlapping.
    - `start` <[number]> A start offset in text, inclusive
    - `end` <[number]> An end offset in text, exclusive

> **NOTE** CSS Coverage doesn't include dynamically injected style tags without sourceURLs.

#### method ChromiumCoverage.stopJSCoverage
- returns: <[Promise]<[Array]<[Object]>>> Promise that resolves to the array of coverage reports for all scripts
  - `url` <[string]> Script URL
  - `scriptId` <[string]> Script ID
  - `source` <[string]> Script content, if applicable.
  - `functions` <[Array]<[Object]>> V8-specific coverage format.
    - `functionName` <[string]>
    - `isBlockCoverage` <[boolean]>
    - `ranges` <[Array]<[Object]>>
      - `count` <[number]>
      - `startOffset` <[number]>
      - `endOffset` <[number]>

> **NOTE** JavaScript Coverage doesn't include anonymous scripts by default. However, scripts with sourceURLs are
reported.

### class: CDPSession
* extends: [EventEmitter](https://nodejs.org/api/events.html#events_class_eventemitter)

The `CDPSession` instances are used to talk raw Chrome Devtools Protocol:
* protocol methods can be called with `session.send` method.
* protocol events can be subscribed to with `session.on` method.

Useful links:
* Documentation on DevTools Protocol can be found here: [DevTools Protocol Viewer](https://chromedevtools.github.io/devtools-protocol/).
* Getting Started with DevTools Protocol: https://github.com/aslushnikov/getting-started-with-cdp/blob/master/README.md

```js
const client = await page.context().newCDPSession(page);
await client.send('Animation.enable');
client.on('Animation.animationCreated', () => console.log('Animation created!'));
const response = await client.send('Animation.getPlaybackRate');
console.log('playback rate is ' + response.playbackRate);
await client.send('Animation.setPlaybackRate', {
  playbackRate: response.playbackRate / 2
});
```

<!-- GEN:toc -->
<!-- GEN:stop -->

#### method CDPSession.detach
- returns: <[Promise]>

Detaches the CDPSession from the target. Once detached, the CDPSession object won't emit any events and can't be used to
send messages.

#### method CDPSession.send
- `method` <[string]> protocol method name
- `params` <[Object]> Optional method parameters
- returns: <[Promise]<[Object]>>

### class: FirefoxBrowser
* extends: [Browser]

Firefox browser instance does not expose Firefox-specific features.

<!-- GEN:toc-extends-Browser -->
<!-- GEN:stop -->

### class: WebKitBrowser
* extends: [Browser]

WebKit browser instance does not expose WebKit-specific features.

<!-- GEN:toc-extends-Browser -->
<!-- GEN:stop -->