WebDriver/RemoteProtocol/WebDriver BiDi/Milestone 19

WebDriver BiDi Milestone 19 - Completed March 29th, 2026

Goal: This milestone will focus on delivering high-priority APIs required for experimental WebDriver BiDi support in Playwright, including capabilities such as CSP bypass, correctly applying user context configurations when invoking `window.open`. In parallel, we will enable widget-level touch event support for web-platform tests and continue evolving the BiDi framework to properly support chrome browsing contexts and workers. This work is foundational for future use cases, including controlling Firefox via MCP servers.

Progress:

• Tracking spreadsheet

Queries:

• Completed Bugs

Milestone Backlog:

Full Query

ID	Summary	Priority	Fx points	Status	Assigned to
1808935	Update asserts for bidi network wdspec tests to take a single expected object	P3	---	RESOLVED	Khalid AlHaddad
1818215	[wdspec] Update tests for pytest asyncio markers	P3	---	RESOLVED	Khalid AlHaddad
1829362	[wdspec] Update bidi tests to use a timeout multiplier instead of a fixed number when waiting for events	P3	---	RESOLVED	Khalid AlHaddad
1847094	Add test to check that viewport dimensions are correct right after browsingContext.create	P3	---	RESOLVED	Khalid AlHaddad
1866749	Only send "log.entryAdded" events for console API calls that use the printer	P3	2	RESOLVED	Alexandra Borovova [:Sasha]
1905086	Support automatic user prompt handling in WebDriver BiDi	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1925272	[geckodriver] Do not decode and create a file from "addon" field when sending "Addon:Install" command	P3	3	RESOLVED	Alexandra Borovova [:Sasha]
1926614	[wdspec] WebDriver BiDi client modules should validate data types in command responses	P3	---	RESOLVED	Khalid AlHaddad
1929144	Make it possible to test additional accessibility properties in WPT	P3	---	RESOLVED	James Teh [:Jamie] (away returning 14 Apr)
1935324	"Action action_sequence failed: BrowsingContext does no longer exist" when trying to dispatch an action to a closed frame	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
1936766	Add Worker helpers to monitor and retrieve worker debuggers	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1936770	Implement "script.realmCreated" and "script.realmDestroyed" events for worker realms	P2	5	RESOLVED	Julian Descottes [:jdescottes]
1941453	Intermittent /webdriver/tests/bidi/input/perform_actions/navigation.py | test_pointer - webdriver.bidi.error.NoSuchFrameException: no such frame (DiscardedBrowsingContextError: Failed to dispatch event "synthesizeMouseAtPoint": Component returned failure	P5	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
1941813	Include top-most frame of the stacktrace to all "log.entryAdded" events for Console API messages	P3	3	RESOLVED	Alexandra Borovova [:Sasha]
1943038	geckodriver doesn't find minidump files for content process crashes	P3	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
1955044	Update geckodriver and deps to Rust 2024	P3	---	RESOLVED	James Graham [:jgraham]
1956885	[wdspec] Add a fixture for WebDriver BiDi tests to keep a list of installed web extensions and remove them at the end of the test	P3	---	RESOLVED	Khalid AlHaddad
1957706	Puppeteer node based tests should use toolchains rather than installing from npm for each test run	P3	3	RESOLVED	Julian Descottes [:jdescottes]
1962355	Synthesizing wheel (and maybe touch) scroll limits values for deltaX and deltaY to the scollable element's viewport	P3	---	RESOLVED	Hiroyuki Ikezoe (:hiro)
1985997	Ensure preload scripts are executed before handling statements following a window.open call	P3	2	RESOLVED	Alexandra Borovova [:Sasha]
1989022	Implement the "browser.setDownloadBehavior" command	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
1993079	Implement "emulation.setNetworkConditions" command for "type: offline"	P2	3	RESOLVED	Julian Descottes [:jdescottes]
1994148	browsingContext.captureScreenshot should return an error instead of a screenshot with a reduced size	P3	---	RESOLVED	Sameem [:sameembaba]
1994996	Handle unicode headers for tentative setExtraHeaders test	P2	2	RESOLVED	Julian Descottes [:jdescottes]
1998377	Sync vendored puppeteer to v24.35.0	P2	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
1998732	Update "emulation.setGeolocationOverride" command reset behavior	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1998734	Update "emulation.setScreenOrientationOverride" command reset behavior	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
1999380	Perma async /webdriver/tests/classic/perform_actions/pointer_dblclick.py | test_dblclick_at_coordinates[<random>] - AssertionError: assert 7 == 8	P5	---	RESOLVED	Hiroyuki Ikezoe (:hiro)
1999481	Downloads triggered by a link with target="_blank" are not linked to their navigation	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
2003820	[wdspec] Update tests to use "iframe" fixture when inlining iframes	P3	---	RESOLVED	Khalid AlHaddad
2003840	A shutdown request for the browser should cancel or pause all active downloads	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
2004973	WebDriver BiDi network.getData command returns RangeError for specific network response body	P2	2	RESOLVED	Julian Descottes [:jdescottes]
2005546	Move the logic of applying user agent, locale, timezone, screen orientation, and screen settings configurations to the parent process	P2	3	RESOLVED	Alexandra Borovova [:Sasha]
2005558	Apply viewport settings for new browsing contexts before a browser element is attached	P2	5	RESOLVED	Alexandra Borovova [:Sasha]
2005621	mach test is no longer able to run marionette tests	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2007385	Events for user prompts opened or closed within an iframe do not reference the iframe's context ID on Android	P3	2	RESOLVED	Alexandra Borovova [:Sasha]
2008345	Allow configuration of "implicit" and "pageLoad" timeouts to accept "null" values	P3	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2008527	Release marionette-driver 3.5.0	P2	1	RESOLVED	Alexandra Borovova [:Sasha]
2008945	"#toBrowserWindowCoordinates()" incorrectly uses the content window’s device pixel ratio instead of the chrome window’s.	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2011113	Intermittent Page Page.waitForNetworkIdle should work with delayed response (page.spec.js) | expected PASS	P5	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2011471	Simplify logic for commands manipulating the window states, size and position	P3	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2011599	[wpt-sync] Sync PR 57268 - Move tests for external WebDriver classic APIs to a dedicated subfolder	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2011659	New wpt failures in /webdriver/tests/classic/external/global_privacy_control/get.py	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2011830	[wdspec] Enable test "mozilla/tests/webdriver/harness/detect_crash.py" and other formerly crashing tests for Android	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2011832	High Frequent win bustage error: test failed, to rerun pass `-p geckodriver --bin geckodriver` (assertion failed: dmp_file_present)	P5	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2012120	Enhance trace logging of application shutdown	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2012405	Intermittent Windows Debug Mn [taskcluster:error] Aborting task... due to invalid maxRunTime	P2	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2012740	[wptrunner] Extra preferences as specified via "--setpref" should not be overwritten with required preferences	P2	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2013822	Wait for navigation-committed event for navigation to error page	P3	2	RESOLVED	Julian Descottes [:jdescottes]
2014049	Puppeteer package-lock.json should not be ignored by git	P3	1	RESOLVED	Julian Descottes [:jdescottes]
2014665	[wdspec] Add wheel scroll tests for WebDriver classic and BiDi which utilize high deltaX and deltaY values	P2	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2015448	Marionette tests don't emit group_result, group_start, or group_end in structured logging	P3	---	RESOLVED	Florian Quèze [:florian]
2016112	Intermittent TVw ::: Test verification FAIL | TinderboxPrint: Per-test run of ...\set_viewport\user_contexts.py<br/>: FAILURE	P5	1	RESOLVED	Alexandra Borovova [:Sasha]
2016673	[bidi] Don't serialize UA widgets.	P3	---	RESOLVED	Emilio Cobos Álvarez [:emilio]
2016738	Add wdspec test to check that UA shadow root is not serialized	P3	1	RESOLVED	Julian Descottes [:jdescottes]
2016741	getShadowRoot command returns user agent shadow roots	P2	2	RESOLVED	Julian Descottes [:jdescottes]
2016842	Intermittent TV /webdriver/tests/bidi/script/realm_created/realm_created.py | test_service_worker - webdriver.error.TimeoutException: timeout (500): Timed out after 2.0 seconds with message: Did not receive at least 1 BiDi event(s) | single tracking bug	P3	1	RESOLVED	Julian Descottes [:jdescottes]
2017219	Support in-memory cached JS responses for network.getData	P2	---	RESOLVED	Tooru Fujisawa [:arai]
2018235	Perma wd TEST-UNEXPECTED-PASS | /webdriver/tests/classic/perform_actions/pointer_mouse.py | test_down_closes_browsing_context[with up] - expected FAIL | single tracking bug	P2	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2019511	browsingContext.setViewport can timeout if several contexts are created in parallel	P3	1	RESOLVED	Julian Descottes [:jdescottes]
2019661	Prompts shouldn't be automatically closed when only WebDriver classic is used	P2	2	RESOLVED	Alexandra Borovova [:Sasha]
2019869	Set preference remote.network.maxTotalDataSize in get_data/big_file.py	P3	1	RESOLVED	Julian Descottes [:jdescottes]
2019950	fetch keepalive requests ignore offline network conditions	P2	2	RESOLVED	Julian Descottes [:jdescottes]
2020578	"browsingContext.locateNodes" doesn't allow to retrieve the HTML element (documentElement)	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2020631	The variant `async-event-dispatching` expiration is on 2026-04-01	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2020914	Failure logs from wdspec tests are too big due to reduced number of chunks	P1	1	RESOLVED	Julian Descottes [:jdescottes]
2021832	Remove special cases when converting WebDriver types to Marionette	P3	---	RESOLVED	James Graham [:jgraham]
2022175	[wdspec] Move "wait_for_bidi_events" helper to a fixture	P3	---	RESOLVED	Khalid AlHaddad
2022321	Add missing os_integration tags to marionette-integration test manifests	P3	---	RESOLVED	:jmoss
2022515	[wdspec] Split fixtures and helpers for WebDriver classic and BiDi	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2022644	Add support for "altitudeAngle" and "azimuthAngle" to pointer actions of subtype "touch"	P3	3	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2022910	[puppeteer] Specifying only "altitudeAngle" for synthesized touch event causes a NS_ERROR_ILLEGAL_VALUE error	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2022990	Move shared emulation command logic to _configuration module	P2	2	RESOLVED	Julian Descottes [:jdescottes]
2023468	Release marionette-driver 3.6.0	P3	---	RESOLVED	James Teh [:Jamie] (away returning 14 Apr)
2023636	Update documentation to explain how to test local puppeteer changes on CI	P3	1	RESOLVED	Julian Descottes [:jdescottes]
2023917	browsingContext.reload doesn't reset location of navigated iframe	P3	2	RESOLVED	Julian Descottes [:jdescottes]
2023966	Only update "display" property in metadata files when the "os" field is set as well	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2023978	Improve window manipulation for Wayland headless jobs	P3	2	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2025569	Run each test in test_timeouts.py in a separate tab	P3	1	RESOLVED	Henrik Skupin [:whimboo][⌚️UTC+1]
2025846	Ensure puppeteer artifact is regenerated automatically	P3	1	RESOLVED	Julian Descottes [:jdescottes]

80 Total; 0 Open (0%); 80 Resolved (100%); 0 Verified (0%);