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Emulation

With Playwright you can test your app on any browser as well as emulate a real device such as a mobile phone or tablet. Simply configure the devices you would like to emulate and Playwright will simulate the browser behavior such as "userAgent", "screenSize", "viewport" and if it "hasTouch" enabled. You can also emulate the "geolocation", "locale" and "timezone" for all tests or for a specific test as well as set the "permissions" to show notifications or change the "colorScheme".

Devices

Playwright comes with a registry of device parameters using playwright.devices for selected desktop, tablet and mobile devices. It can be used to simulate browser behavior for a specific device such as user agent, screen size, viewport and if it has touch enabled. All tests will run with the specified device parameters.

from playwright.sync_api import sync_playwright

def run(playwright):
iphone_12 = playwright.devices['iPhone 12']
browser = playwright.webkit.launch(headless=False)
context = browser.new_context(
**iphone_12,
)

with sync_playwright() as playwright:
run(playwright)

Viewport

The viewport is included in the device but you can override it for some tests with page.set_viewport_size().

The same works inside a describe block.

# Create context with given viewport
context = browser.new_context(
viewport={ 'width': 1280, 'height': 1024 }
)

# Resize viewport for individual page
await page.set_viewport_size({"width": 1600, "height": 1200})

# Emulate high-DPI
context = browser.new_context(
viewport={ 'width': 2560, 'height': 1440 },
device_scale_factor=2,

Locale & Timezone

Emulate the user Locale and Timezone which can be set globally for all tests in the config and then overridden for particular tests.

# Emulate locale and time
context = browser.new_context(
locale='de-DE',
timezone_id='Europe/Berlin',
)

Permissions

Allow app to show system notifications.

context = browser.new_context(
permissions=['notifications'],
)

Allow test to request current location.

context.grant_permissions(['geolocation'])

Allow notifications for a specific domain.

context.grant_permissions(['notifications'], origin='https://skype.com')

Revoke all permissions with browser_context.clear_permissions().

context.clear_permissions()

Geolocation

Create a test with "geolocation" permissions granted and geolocation set to a specific area.

context = browser.new_context(
geolocation={"longitude": 48.858455, "latitude": 2.294474},
permissions=["geolocation"]
)

Change the location later:

context.set_geolocation({"longitude": 29.979097, "latitude": 31.134256})

Note you can only change geolocation for all pages in the context.

Color Scheme and Media

Create a test that emulates the users "colorScheme". Supported values are 'light', 'dark', 'no-preference'. You can also emulate the media type with page.emulate_media().

# Create context with dark mode
context = browser.new_context(
color_scheme='dark' # or 'light'
)

# Create page with dark mode
page = browser.new_page(
color_scheme='dark' # or 'light'
)

# Change color scheme for the page
page.emulate_media(color_scheme='dark')

# Change media for page
page.emulate_media(media='print')

User Agent

The User Agent is included in the device and therefore you will rarely need to change it however if you do need to test a different user agent you can override it with the userAgent property.

context = browser.new_context(
user_agent='My user agent'
)

JavaScript Enabled

Emulate a user scenario where JavaScript is disabled.