playwright/docs/emulation.md

# Device and environment emulation

Playwright allows overriding various parameters of the device where the browser is running:
  - viewport size, device scale factor, touch support
  - locale, timezone
  - color scheme
  - geolocation
  - etc

Most of these parameters are configured during the browser context construction, but some of them such as viewport size can be changed for individual pages.

#### Contents
- [User agent](#user-agent)
- [Viewport, color scheme](#viewport-color-scheme)
- [Devices](#select-options)
- [Locale & Timezone](#locale--timezone)
- [Permissions](#permissions)
- [Geolocation](#geolocation)

<br/>

## User agent

```js
  const context = await browser.newContext({
    userAgent: 'My user agent'
  });
```

All pages created in the context above will share the user agent specified.

#### API reference

- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)

<br/>

## Viewport, color scheme

Create a context with custom viewport size:

```js
  const context = await browser.newContext({
    viewport: {
      width: 1280,
      height: 1024
    }
  });

```
Resize viewport for individual pages:

```js
  await page.setViewportSize({ 'width': 1600, 'height': 1200 });
```

Emulate desktop device with the high-DPI screen and touch support:

```js
  const context = await browser.newContext({
    viewport: {
      width: 2560,
      height: 1440,
    },
    deviceScaleFactor: 2,
    hasTouch: true
  });
```

Create device with the dark color scheme:
```js
  const context = await browser.newContext({
    colorScheme: 'dark'
  });
```

Change color scheme for individual pages:

```js
  await page.emulateMedia({ colorScheme: 'dark' });
```

#### API reference

- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)
- [`page.setViewportSize(viewportSize)`](./api.md#pagesetviewportsizeviewportsize)

<br/>

## Devices

Playwright comes with a registry of device parameters for selected mobile devices. It can be used to simulate browser behavior on a mobile device:

```js
  const { chromium, devices } = require('playwright');
  const browser = await chromium.launch();

  const pixel2 = devices['Pixel 2'];
  const context = await browser.newContext({
    ...pixel2,
  });
```

All pages created in the context above will share the same device parameters.

#### API reference

- [`playwright.devices`](./api.md#playwrightdevices)
- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)

<br/>

#### API reference

- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)
- [`page.emulateMedia([options])`](./api.md#pageemulatemediaoptions)

<br/>

## Locale & timezone

```js
  const context = await browser.newContext({
    locale: 'de-DE',
    timezoneId: 'Europe/Berlin',
  });
```

#### API reference

- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)

<br/>

## Permissions

Allow all pages in the context to show system notifications:
```js
  const context = await browser.newContext({
    permissions: ['notifications'],
  });
```

Grant all pages in the existing context access to current location:
```js
  await context.grantPermissions(['geolocation']);
```

Grant notifications access from a specific domain:
```js
  await context.grantPermissions(['notifications'], {origin: 'https://skype.com'} );
```
Revoke all permissions:
```js
  await context.clearPermissions();
```

#### API reference

- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)
- [`browserContext.grantPermissions(permissions[][, options])`](./api.md#browsercontextgrantpermissionspermissions-options)
- [`browserContext.clearPermissions()`](./api.md#browsercontextclearpermissions)

<br/>

## Geolocation
Create a context with `"geolocation"` permissions granted:
```js
  const context = await browser.newContext({
    geolocation: { longitude: 48.858455, latitude: 2.294474 },
    permissions: ['geolocation']
  });
```
Change the location later:

```js
  await context.setGeolocation({ longitude: 29.979097, latitude: 31.134256 };
```
**Note** you can only change geolocation for all pages in the context.

#### API reference

- [`browser.newContext([options])`](./api.md#browsernewcontextoptions)
- [`browserContext.setGeolocation(geolocation)`](./api.md#browsercontextsetgeolocationgeolocation)

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