playwright/docs/src/api/class-browser.md

# class: Browser
* extends: [EventEmitter]

A Browser is created via [`method: BrowserType.launch`]. 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();
})();
```

```python async
import asyncio
from playwright.async_api import async_playwright

async def run(playwright):
    firefox = playwright.firefox
    browser = await firefox.launch()
    page = await browser.new_page()
    await page.goto("https://example.com")
    await browser.close()

async def main():
    async with async_playwright() as playwright:
        await run(playwright)
asyncio.run(main())
```

```python sync
from playwright.sync_api import sync_playwright

def run(playwright):
    firefox = playwright.firefox
    browser = firefox.launch()
    page = browser.new_page()
    page.goto("https://example.com")
    browser.close()

with sync_playwright() as playwright:
    run(playwright)
```

## event: Browser.disconnected
- type: <[Browser]>

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 [`method: Browser.close`] method was called.

## async method: Browser.close

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

In case this browser is connected to, 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`
```

```python async
browser = await pw.webkit.launch()
print(len(browser.contexts())) # prints `0`
context = await browser.new_context()
print(len(browser.contexts())) # prints `1`
```

```python sync
browser = pw.webkit.launch()
print(len(browser.contexts())) # prints `0`
context = browser.new_context()
print(len(browser.contexts())) # prints `1`
```

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

Indicates that the browser is connected.

## async method: Browser.newContext
- returns: <[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');
})();
```

```python async
browser = await playwright.firefox.launch() # or "chromium" or "webkit".
# create a new incognito browser context.
context = await browser.new_context()
# create a new page in a pristine context.
page = await context.new_page()
await page.goto("https://example.com")
```

```python sync
browser = playwright.firefox.launch() # or "chromium" or "webkit".
# create a new incognito browser context.
context = browser.new_context()
# create a new page in a pristine context.
page = context.new_page()
page.goto("https://example.com")
```

### option: Browser.newContext.-inline- = %%-shared-context-params-list-%%

### option: Browser.newContext.proxy = %%-context-option-proxy-%%

### option: Browser.newContext.storageState = %%-js-python-context-option-storage-state-%%

### option: Browser.newContext.storageState = %%-csharp-java-context-option-storage-state-%%

### option: Browser.newContext.storageStatePath = %%-csharp-java-context-option-storage-state-path-%%

## async method: Browser.newPage
- returns: <[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 [`method: Browser.newContext`] followed by the
[`method: BrowserContext.newPage`] to control their exact life times.

### option: Browser.newPage.-inline- = %%-shared-context-params-list-%%

### option: Browser.newPage.proxy = %%-context-option-proxy-%%

### option: Browser.newPage.storageState = %%-js-python-context-option-storage-state-%%

### option: Browser.newPage.storageState = %%-csharp-java-context-option-storage-state-%%

### option: Browser.newPage.storageStatePath = %%-csharp-java-context-option-storage-state-path-%%

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

Returns the browser version.