class-browsertype.mdx

id	class-browsertype
title	BrowserType

import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem'; import HTMLCard from '@site/src/components/HTMLCard';

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:

from playwright.sync_api import sync_playwright

def run(playwright):
    chromium = playwright.chromium
    browser = chromium.launch()
    page = browser.new_page()
    page.goto("https://example.com")
    # other actions...
    browser.close()

with sync_playwright() as playwright:
    run(playwright)

import asyncio
from playwright.async_api import async_playwright

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

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

Methods

connect {#browser-type-connect}

Added in: v1.8browserType.connect

This method attaches Playwright to an existing browser instance. When connecting to another browser launched via BrowserType.launchServer in Node.js, the major and minor version needs to match the client version (1.2.3 → is compatible with 1.2.x).

Usage

browser_type.connect(ws_endpoint)
browser_type.connect(ws_endpoint, **kwargs)

Arguments

ws_endpoint str Added in: v1.10 #

A browser websocket endpoint to connect to.
headers Dict[str, str] (optional) Added in: v1.11 #

Additional HTTP headers to be sent with web socket connect request. Optional.
slow_mo float (optional) Added in: v1.10 #

Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on. Defaults to 0.
timeout float (optional) Added in: v1.10 #

Maximum time in milliseconds to wait for the connection to be established. Defaults to 0 (no timeout).

Returns

Browser #

connect_over_cdp {#browser-type-connect-over-cdp}

Added in: v1.9browserType.connect_over_cdp

This method attaches Playwright to an existing browser instance using the Chrome DevTools Protocol.

The default browser context is accessible via browser.contexts.

:::note Connecting over the Chrome DevTools Protocol is only supported for Chromium-based browsers. :::

Usage

browser = playwright.chromium.connect_over_cdp("http://localhost:9222")
default_context = browser.contexts[0]
page = default_context.pages[0]

browser = await playwright.chromium.connect_over_cdp("http://localhost:9222")
default_context = browser.contexts[0]
page = default_context.pages[0]

Arguments

endpoint_url str Added in: v1.11 #

A CDP websocket endpoint or http url to connect to. For example http://localhost:9222/ or ws://127.0.0.1:9222/devtools/browser/387adf4c-243f-4051-a181-46798f4a46f4.
headers Dict[str, str] (optional) Added in: v1.11 #

Additional HTTP headers to be sent with connect request. Optional.
slow_mo float (optional) Added in: v1.11 #

Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on. Defaults to 0.
timeout float (optional) Added in: v1.11 #

Maximum time in milliseconds to wait for the connection to be established. Defaults to 30000 (30 seconds). Pass 0 to disable timeout.

Returns

Browser #

executable_path {#browser-type-executable-path}

Added in: v1.8browserType.executable_path

A path where Playwright expects to find a bundled browser executable.

Usage

browser_type.executable_path

Returns

str #

launch {#browser-type-launch}

Added in: v1.8browserType.launch

Returns the browser instance.

Usage

You can use ignore_default_args to filter out --mute-audio from default arguments:

browser = playwright.chromium.launch( # or "firefox" or "webkit".
    ignore_default_args=["--mute-audio"]
)

browser = await playwright.chromium.launch( # or "firefox" or "webkit".
    ignore_default_args=["--mute-audio"]
)

Chromium-only Playwright can also be used to control the Google Chrome or Microsoft Edge browsers, 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 executable_path option with extreme caution.

If Google Chrome (rather than Chromium) is preferred, a Chrome Canary or Dev Channel build is suggested.

Stock browsers like Google Chrome and Microsoft Edge are suitable for tests that require proprietary media codecs for video playback. See this article for other differences between Chromium and Chrome. This article describes some differences for Linux users.

Arguments

args List[str] (optional)#

Additional arguments to pass to the browser instance. The list of Chromium flags can be found here.
channel str (optional)#

Browser distribution channel. Supported values are "chrome", "chrome-beta", "chrome-dev", "chrome-canary", "msedge", "msedge-beta", "msedge-dev", "msedge-canary". Read more about using Google Chrome and Microsoft Edge.
chromium_sandbox bool (optional)#

Enable Chromium sandboxing. Defaults to false.
devtools bool (optional)#

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.
downloads_path Union[str, pathlib.Path] (optional)#

If specified, accepted downloads are downloaded into this directory. Otherwise, temporary directory is created and is deleted when browser is closed. In either case, the downloads are deleted when the browser context they were created in is closed.
env Dict[str, str|float|bool] (optional)#

Specify environment variables that will be visible to the browser. Defaults to process.env.
executable_path Union[str, pathlib.Path] (optional)#

Path to a browser executable to run instead of the bundled one. If executable_path is a relative path, then it is resolved relative to the current working directory. Note that Playwright only works with the bundled Chromium, Firefox or WebKit, use at your own risk.
firefox_user_prefs Dict[str, str|float|bool] (optional)#

Firefox user preferences. Learn more about the Firefox user preferences at about:config.
handle_sighup bool (optional)#

Close the browser process on SIGHUP. Defaults to true.
handle_sigint bool (optional)#

Close the browser process on Ctrl-C. Defaults to true.
handle_sigterm bool (optional)#

Close the browser process on SIGTERM. Defaults to true.
headless bool (optional)#

Whether to run browser in headless mode. More details for Chromium and Firefox. Defaults to true unless the devtools option is true.
ignore_default_args bool|List[str] (optional)#

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 Dict (optional)#
- server str
  
  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 str (optional)
  
  Optional comma-separated domains to bypass proxy, for example ".com, chromium.org, .domain.com".
- username str (optional)
  
  Optional username to use if HTTP proxy requires authentication.
- password str (optional)
  
  Optional password to use if HTTP proxy requires authentication.
Network proxy settings.
slow_mo float (optional)#

Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
timeout float (optional)#

Maximum time in milliseconds to wait for the browser instance to start. Defaults to 30000 (30 seconds). Pass 0 to disable timeout.
traces_dir Union[str, pathlib.Path] (optional)#

If specified, traces are saved into this directory.

Returns

Browser #

launch_persistent_context {#browser-type-launch-persistent-context}

Added in: v1.8browserType.launch_persistent_context

Returns the persistent browser context instance.

Launches browser that uses persistent storage located at user_data_dir and returns the only context. Closing this context will automatically close the browser.

Usage

browser_type.launch_persistent_context(user_data_dir)
browser_type.launch_persistent_context(user_data_dir, **kwargs)

Arguments

user_data_dir Union[str, pathlib.Path]#

Path to a User Data Directory, which stores browser session data like cookies and local storage. More details for Chromium and Firefox. Note that Chromium's user data directory is the parent directory of the "Profile Path" seen at chrome://version. Pass an empty string to use a temporary directory instead.
accept_downloads bool (optional)#

Whether to automatically download all the attachments. Defaults to true where all the downloads are accepted.
args List[str] (optional)#

Additional arguments to pass to the browser instance. The list of Chromium flags can be found here.
base_url str (optional)#

When using page.goto(), page.route(), page.wait_for_url(), page.expect_request(), or page.expect_response() it takes the base URL in consideration by using the URL() constructor for building the corresponding URL. Examples:
- baseURL: http://localhost:3000 and navigating to /bar.html results in http://localhost:3000/bar.html
- baseURL: http://localhost:3000/foo/ and navigating to ./bar.html results in http://localhost:3000/foo/bar.html
- baseURL: http://localhost:3000/foo (without trailing slash) and navigating to ./bar.html results in http://localhost:3000/bar.html
bypass_csp bool (optional)#

Toggles bypassing page's Content-Security-Policy.
channel str (optional)#

Browser distribution channel. Supported values are "chrome", "chrome-beta", "chrome-dev", "chrome-canary", "msedge", "msedge-beta", "msedge-dev", "msedge-canary". Read more about using Google Chrome and Microsoft Edge.
chromium_sandbox bool (optional)#

Enable Chromium sandboxing. Defaults to false.
color_scheme "light"|"dark"|"no-preference"|"null" (optional)#

Emulates 'prefers-colors-scheme' media feature, supported values are 'light', 'dark', 'no-preference'. See page.emulate_media() for more details. Passing 'null' resets emulation to system defaults. Defaults to 'light'.
device_scale_factor float (optional)#

Specify device scale factor (can be thought of as dpr). Defaults to 1. Learn more about emulating devices with device scale factor.
devtools bool (optional)#

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.
downloads_path Union[str, pathlib.Path] (optional)#

If specified, accepted downloads are downloaded into this directory. Otherwise, temporary directory is created and is deleted when browser is closed. In either case, the downloads are deleted when the browser context they were created in is closed.
env Dict[str, str|float|bool] (optional)#

Specify environment variables that will be visible to the browser. Defaults to process.env.
executable_path Union[str, pathlib.Path] (optional)#

Path to a browser executable to run instead of the bundled one. If executable_path is a relative path, then it is resolved relative to the current working directory. Note that Playwright only works with the bundled Chromium, Firefox or WebKit, use at your own risk.
extra_http_headers Dict[str, str] (optional)#

An object containing additional HTTP headers to be sent with every request.
forced_colors "active"|"none"|"null" (optional)#

Emulates 'forced-colors' media feature, supported values are 'active', 'none'. See page.emulate_media() for more details. Passing 'null' resets emulation to system defaults. Defaults to 'none'.
geolocation Dict (optional)#
- latitude float
  
  Latitude between -90 and 90.
- longitude float
  
  Longitude between -180 and 180.
- accuracy float (optional)
  
  Non-negative accuracy value. Defaults to 0.
handle_sighup bool (optional)#

Close the browser process on SIGHUP. Defaults to true.
handle_sigint bool (optional)#

Close the browser process on Ctrl-C. Defaults to true.
handle_sigterm bool (optional)#

Close the browser process on SIGTERM. Defaults to true.
has_touch bool (optional)#

Specifies if viewport supports touch events. Defaults to false. Learn more about mobile emulation.
headless bool (optional)#

Whether to run browser in headless mode. More details for Chromium and Firefox. Defaults to true unless the devtools option is true.
http_credentials Dict (optional)#
- username str
- password str
- origin str (optional)
  
  Restrain sending http credentials on specific origin (scheme://host:port).
Credentials for HTTP authentication. If no origin is specified, the username and password are sent to any servers upon unauthorized responses.
ignore_default_args bool|List[str] (optional)#

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.
ignore_https_errors bool (optional)#

Whether to ignore HTTPS errors when sending network requests. Defaults to false.
is_mobile bool (optional)#

Whether the meta viewport tag is taken into account and touch events are enabled. isMobile is a part of device, so you don't actually need to set it manually. Defaults to false and is not supported in Firefox. Learn more about mobile emulation.
java_script_enabled bool (optional)#

Whether or not to enable JavaScript in the context. Defaults to true. Learn more about disabling JavaScript.
locale str (optional)#

Specify user locale, for example en-GB, de-DE, etc. Locale will affect navigator.language value, Accept-Language request header value as well as number and date formatting rules. Learn more about emulation in our emulation guide.
no_viewport bool (optional)#

Does not enforce fixed viewport, allows resizing window in the headed mode.
offline bool (optional)#

Whether to emulate network being offline. Defaults to false. Learn more about network emulation.
permissions List[str] (optional)#

A list of permissions to grant to all pages in this context. See browser_context.grant_permissions() for more details.
proxy Dict (optional)#
- server str
  
  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 str (optional)
  
  Optional comma-separated domains to bypass proxy, for example ".com, chromium.org, .domain.com".
- username str (optional)
  
  Optional username to use if HTTP proxy requires authentication.
- password str (optional)
  
  Optional password to use if HTTP proxy requires authentication.
Network proxy settings.
record_har_content "omit"|"embed"|"attach" (optional)#

Optional setting to control resource content management. If omit is specified, content is not persisted. If attach is specified, resources are persisted as separate files and all of these files are archived along with the HAR file. Defaults to embed, which stores content inline the HAR file as per HAR specification.
record_har_mode "full"|"minimal" (optional)#

When set to minimal, only record information necessary for routing from HAR. This omits sizes, timing, page, cookies, security and other types of HAR information that are not used when replaying from HAR. Defaults to full.
record_har_omit_content bool (optional)#

Optional setting to control whether to omit request content from the HAR. Defaults to false.
record_har_path Union[str, pathlib.Path] (optional)#

Enables HAR recording for all pages into the specified HAR file on the filesystem. If not specified, the HAR is not recorded. Make sure to call browser_context.close() for the HAR to be saved.
record_har_url_filter str|Pattern (optional)#
record_video_dir Union[str, pathlib.Path] (optional)#

Enables video recording for all pages into the specified directory. If not specified videos are not recorded. Make sure to call browser_context.close() for videos to be saved.
record_video_size Dict (optional)#
- width int
  
  Video frame width.
- height int
  
  Video frame height.
Dimensions of the recorded videos. If not specified the size will be equal to viewport scaled down to fit into 800x800. If viewport is not configured explicitly the video size defaults to 800x450. Actual picture of each page will be scaled down if necessary to fit the specified size.
reduced_motion "reduce"|"no-preference"|"null" (optional)#

Emulates 'prefers-reduced-motion' media feature, supported values are 'reduce', 'no-preference'. See page.emulate_media() for more details. Passing 'null' resets emulation to system defaults. Defaults to 'no-preference'.
screen Dict (optional)#
- width int
  
  page width in pixels.
- height int
  
  page height in pixels.
Emulates consistent window screen size available inside web page via window.screen. Is only used when the viewport is set.
service_workers "allow"|"block" (optional)#

Whether to allow sites to register Service workers. Defaults to 'allow'.
- 'allow': Service Workers can be registered.
- 'block': Playwright will block all registration of Service Workers.
slow_mo float (optional)#

Slows down Playwright operations by the specified amount of milliseconds. Useful so that you can see what is going on.
strict_selectors bool (optional)#

If set to true, enables strict selectors mode for this context. In the strict selectors mode all operations on selectors that imply single target DOM element will throw when more than one element matches the selector. This option does not affect any Locator APIs (Locators are always strict). See Locator to learn more about the strict mode.
timeout float (optional)#

Maximum time in milliseconds to wait for the browser instance to start. Defaults to 30000 (30 seconds). Pass 0 to disable timeout.
timezone_id str (optional)#

Changes the timezone of the context. See ICU's metaZones.txt for a list of supported timezone IDs.
traces_dir Union[str, pathlib.Path] (optional)#

If specified, traces are saved into this directory.
user_agent str (optional)#

Specific user agent to use in this context.
viewport NoneType|Dict (optional)#
- width int
  
  page width in pixels.
- height int
  
  page height in pixels.
Sets a consistent viewport for each page. Defaults to an 1280x720 viewport. no_viewport disables the fixed viewport. Learn more about viewport emulation.

Returns

BrowserContext #

name {#browser-type-name}

Added in: v1.8browserType.name

Returns browser name. For example: 'chromium', 'webkit' or 'firefox'.

Usage

browser_type.name

Returns

str #

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Methods

connect {#browser-type-connect}

connect_over_cdp {#browser-type-connect-over-cdp}

executable_path {#browser-type-executable-path}

launch {#browser-type-launch}

launch_persistent_context {#browser-type-launch-persistent-context}

name {#browser-type-name}

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Methods

connect {#browser-type-connect}

connect_over_cdp {#browser-type-connect-over-cdp}

executable_path {#browser-type-executable-path}

launch {#browser-type-launch}

launch_persistent_context {#browser-type-launch-persistent-context}

name {#browser-type-name}