---
id: emulation
title: "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

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.

- [Devices](#devices)
- [User agent](#user-agent)
- [Viewport](#viewport)
- [Locale & timezone](#locale--timezone)
- [Permissions](#permissions)
- [Geolocation](#geolocation)
- [Color scheme and media](#color-scheme-and-media)

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

<br/>

## User agent

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

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

#### API reference
- [browser.newContext([options])](api/class-browser.md#browsernewcontextoptions)

<br/>

## Viewport

Create a context with custom viewport size:

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

// Resize viewport for individual page
await page.setViewportSize({ width: 1600, height: 1200 });

// Emulate high-DPI
const context = await browser.newContext({
  viewport: { width: 2560, height: 1440 },
  deviceScaleFactor: 2,
});
```

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

<br/>

## Locale & timezone

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

#### API reference
- [browser.newContext([options])](api/class-browser.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/class-browser.md#browsernewcontextoptions)
- [browserContext.grantPermissions(permissions[, options])](api/class-browsercontext.md#browsercontextgrantpermissionspermissions-options)
- [browserContext.clearPermissions()](api/class-browsercontext.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']
});
```

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

<br/>

## Color scheme and media

Create a context with dark or light mode. Pages created in this context will follow this color scheme preference.

```js
// Create context with dark mode
const context = await browser.newContext({
  colorScheme: 'dark' // or 'light'
});

// Create page with dark mode
const page = await browser.newPage({
  colorScheme: 'dark' // or 'light'
});

// Change color scheme for the page
await page.emulateMedia({ colorScheme: 'dark' });

// Change media for page
await page.emulateMedia({ media: 'print' });
```

#### API reference
- [browser.newContext([options])](api/class-browser.md#browsernewcontextoptions)
- [page.emulateMedia(params)](api/class-page.md#pageemulatemediaparams)

[Playwright]: api/class-playwright.md "Playwright"
[Browser]: api/class-browser.md "Browser"
[BrowserContext]: api/class-browsercontext.md "BrowserContext"
[Page]: api/class-page.md "Page"
[Frame]: api/class-frame.md "Frame"
[ElementHandle]: api/class-elementhandle.md "ElementHandle"
[JSHandle]: api/class-jshandle.md "JSHandle"
[ConsoleMessage]: api/class-consolemessage.md "ConsoleMessage"
[Dialog]: api/class-dialog.md "Dialog"
[Download]: api/class-download.md "Download"
[Video]: api/class-video.md "Video"
[FileChooser]: api/class-filechooser.md "FileChooser"
[Keyboard]: api/class-keyboard.md "Keyboard"
[Mouse]: api/class-mouse.md "Mouse"
[Touchscreen]: api/class-touchscreen.md "Touchscreen"
[Request]: api/class-request.md "Request"
[Response]: api/class-response.md "Response"
[Selectors]: api/class-selectors.md "Selectors"
[Route]: api/class-route.md "Route"
[WebSocket]: api/class-websocket.md "WebSocket"
[TimeoutError]: api/class-timeouterror.md "TimeoutError"
[Accessibility]: api/class-accessibility.md "Accessibility"
[Worker]: api/class-worker.md "Worker"
[BrowserServer]: api/class-browserserver.md "BrowserServer"
[BrowserType]: api/class-browsertype.md "BrowserType"
[Logger]: api/class-logger.md "Logger"
[ChromiumBrowser]: api/class-chromiumbrowser.md "ChromiumBrowser"
[ChromiumBrowserContext]: api/class-chromiumbrowsercontext.md "ChromiumBrowserContext"
[ChromiumCoverage]: api/class-chromiumcoverage.md "ChromiumCoverage"
[CDPSession]: api/class-cdpsession.md "CDPSession"
[FirefoxBrowser]: api/class-firefoxbrowser.md "FirefoxBrowser"
[WebKitBrowser]: api/class-webkitbrowser.md "WebKitBrowser"
[Array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array "Array"
[Buffer]: https://nodejs.org/api/buffer.html#buffer_class_buffer "Buffer"
[ChildProcess]: https://nodejs.org/api/child_process.html "ChildProcess"
[Element]: https://developer.mozilla.org/en-US/docs/Web/API/element "Element"
[Error]: https://nodejs.org/api/errors.html#errors_class_error "Error"
[Evaluation Argument]: ./core-concepts.md#evaluationargument "Evaluation Argument"
[Map]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map "Map"
[Object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object "Object"
[Promise]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise "Promise"
[RegExp]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp "RegExp"
[Serializable]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#Description "Serializable"
[UIEvent.detail]: https://developer.mozilla.org/en-US/docs/Web/API/UIEvent/detail "UIEvent.detail"
[URL]: https://nodejs.org/api/url.html "URL"
[USKeyboardLayout]: ../src/usKeyboardLayout.ts "USKeyboardLayout"
[UnixTime]: https://en.wikipedia.org/wiki/Unix_time "Unix Time"
[boolean]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type "Boolean"
[function]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function "Function"
[iterator]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Iteration_protocols "Iterator"
[null]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/null "null"
[number]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type "Number"
[origin]: https://developer.mozilla.org/en-US/docs/Glossary/Origin "Origin"
[selector]: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors "selector"
[Readable]: https://nodejs.org/api/stream.html#stream_class_stream_readable "Readable"
[string]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type "string"
[xpath]: https://developer.mozilla.org/en-US/docs/Web/XPath "xpath"
