script: Decouple ownership of the media element from IPC router callback by tharkum · Pull Request #41131 · servo/servo

tharkum · 2025-12-08T10:33:10Z

Added new invocation struct HTMLMediaElementEventHandler that allows to decouple ownership of the HTMLMediaElement from the IPC router callback (break cyclic reference dependency) by replacing a Trusted wrapper with more suitable WeakRef.
Note that WeakRef is not thread-safe and MUST be rooted and/or deleted on the script thread.

Testing: Regressions in the following tests caused by overly aggressive GC on document activity change to Inactive and will be follow up in #41138

html/semantics/embedded-content/media-elements/autoplay-allowed-by-feature-policy.https.sub.html
html/semantics/embedded-content/media-elements/autoplay-default-feature-policy.https.sub.html
html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html

Fixes: #40243

github-actions · 2025-12-08T10:51:49Z

🔨 Triggering try run (#20025577970) for Linux (WPT)

github-actions · 2025-12-08T11:24:20Z

Test results for linux-wpt from try job (#20025577970):

Flaky unexpected result (28)

OK /IndexedDB/idbfactory_open.any.html
- FAIL [expected PASS] subtest: Calling open() with version argument 1.5 should not throw.
```
assert_equals: version expected 1 but got 9007199254740991
```
OK /_mozilla/mozilla/getBoundingClientRect.html (#39668)
- FAIL [expected PASS] subtest: getBoundingClientRect 1
```
assert_equals: expected 62 but got 60.35
```
OK /_mozilla/webxr/create_session.https.html
- FAIL [expected PASS] subtest: create_session
```
can't access property "simulateDeviceConnection", navigator.xr.test is undefined
```
ERROR [expected TIMEOUT] /_mozilla/webxr/sessionavailable.https.html
OK /css/css-cascade/layer-font-face-override.html (#35935)
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 1
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 2
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
- PASS [expected FAIL] subtest: Null value should submit nothing
- PASS [expected FAIL] subtest: Newline normalization - \r\n in name (urlencoded)
ERROR /fetch/metadata/generated/serviceworker.https.sub.html (#36247)
- FAIL [expected PASS] subtest: sec-fetch-site - Same origin, no options - registration
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
CRASH [expected OK] /html/anonymous-iframe/worker-cookies.tentative.https.window.html?worker=dedicated_worker
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.html (#29049)
- PASS [expected FAIL] subtest: Same-origin navigation started from unload handler must be ignored
OK /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html (#28697)
- PASS [expected FAIL] subtest: aElement.click() before the load event must NOT replace
CRASH [expected OK] /html/canvas/element/canvas-host/2d.canvas.host.initial.reset.path.html
TIMEOUT /html/semantics/embedded-content/media-elements/preserves-pitch.html (#40352)
- PASS [expected TIMEOUT] subtest: Speed-ups should not change the pitch when preservesPitch=true
- PASS [expected NOTRUN] subtest: Slow-downs should not change the pitch when preservesPitch=true
- TIMEOUT [expected NOTRUN] subtest: Speed-ups should change the pitch when preservesPitch=false
```
Test timed out
```

OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-location-assign.html (#32863)

FAIL [expected PASS] subtest: Navigating iframe loading='lazy' before it is loaded: location.assign

uncaught exception: Error: assert_equals: expected "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?nav" but got "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?src"

OK /html/semantics/forms/form-submission-0/jsurl-form-submit.tentative.html (#36489)
- PASS [expected FAIL] subtest: Verifies that form submissions scheduled inside javascript: urls take precedence over the javascript: url's return value.
OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
- FAIL [expected PASS] subtest: text/plain: Basic test (formdata event)
```
assert_equals: expected "basic=test\r\n" but got ""
```
- FAIL [expected PASS] subtest: text/plain: Basic File test (normal form)
```
assert_equals: expected "basic=file-test.txt\r\n" but got ""
```
- PASS [expected FAIL] subtest: text/plain: Basic File test (formdata event)
- PASS [expected FAIL] subtest: text/plain: 0x00 in value (formdata event)
OK /html/semantics/forms/form-submission-0/urlencoded2.window.html (#28687)
- FAIL [expected PASS] subtest: application/x-www-form-urlencoded: Basic File test (normal form)
```
assert_equals: expected "basic=file-test.txt" but got ""
```
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: Basic File test (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: \r\n in filename (normal form)
OK /mixed-content/tentative/autoupgrades/video-upgrade.https.sub.html (#41135)
- FAIL [expected PASS] subtest: Video autoupgraded
```
assert_equals: Length. expected 1 but got Infinity
```
TIMEOUT /resource-timing/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)
CRASH [expected OK] /trusted-types/eval-csp-no-tt.html
TIMEOUT /trusted-types/trusted-types-navigation.html?06-10 (#37920)
- TIMEOUT [expected FAIL] subtest: Navigate a frame via anchor with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.
CRASH [expected TIMEOUT] /wasm/webapi/empty-body.any.worker.html
OK /webdriver/tests/classic/accept_alert/accept.py
- FAIL [expected PASS] subtest: test_null_response_value
```
AssertionError: no such alert (404): No user prompt is currently active.
```
OK /webdriver/tests/classic/close_window/close.py
- ERROR [expected PASS] subtest: test_no_top_browsing_context
```
setup error: webdriver.error.NoSuchElementException: no such element (404)
```
OK /webdriver/tests/classic/execute_script/properties.py
- FAIL [expected PASS] subtest: test_content_attribute
```
AssertionError: no such window (404): No such window
```
OK /webdriver/tests/classic/find_element/find.py
- ERROR [expected PASS] subtest: test_no_top_browsing_context
```
setup error: webdriver.error.NoSuchElementException: no such element (404)
```
OK /webdriver/tests/classic/find_element/user_prompts.py
- FAIL [expected PASS] subtest: test_accept[alert-None]
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/set_window_rect/user_prompts.py
- FAIL [expected PASS] subtest: test_accept[alert-None]
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

Stable unexpected results that are known to be intermittent (25)

TIMEOUT /FileAPI/url/url-in-tags-revoke.window.html (#19978)
- TIMEOUT [expected PASS] subtest: Fetching a blob URL immediately before revoking it works in <script> tags.
```
Test timed out
```
OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
OK /IndexedDB/transaction-deactivation-timing.any.worker.html (#38808)
- PASS [expected FAIL] subtest: New transactions are deactivated before next task
FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
- TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo
```
Test timed out
```
OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #45
- PASS [expected FAIL] subtest: WebGL test #47
- PASS [expected FAIL] subtest: WebGL test #49
- PASS [expected FAIL] subtest: WebGL test #51
- FAIL [expected PASS] subtest: WebGL test #53
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #55
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #57
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #59
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- PASS [expected FAIL] subtest: WebGL test #61
- PASS [expected FAIL] subtest: WebGL test #63
- And 10 more unexpected results...
OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
- PASS [expected FAIL] subtest: Delete layer invalidates @font-face
OK /css/css-fonts/generic-family-keywords-001.html (#37467)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(khmer-mul)
```
assert_equals: quoted generic(khmer-mul) matches  @font-face rule expected 50 but got 30
```
OK /css/css-fonts/generic-family-keywords-002.html (#40929)
- PASS [expected FAIL] subtest: font-family: -webkit-serif treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-sans-serif treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-cursive treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-fantasy treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-monospace treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-system-ui treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-math treated as <font-family>, not <generic-name>
- FAIL [expected PASS] subtest: font-family: -webkit-generic(fangsong) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- FAIL [expected PASS] subtest: font-family: -webkit-generic(kai) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- FAIL [expected PASS] subtest: font-family: -webkit-generic(khmer-mul) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- And 12 more unexpected results...
OK /css/css-fonts/generic-family-keywords-003.html (#38994)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-serif (drawing text in a canvas)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-dest
- PASS [expected FAIL] subtest: sec-fetch-user
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Cross-site
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/generated/element-img-environment-change.https.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Same origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Same Origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - attributes: crossorigin
- And 4 more unexpected results...
OK /fetch/metadata/generated/element-img-environment-change.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-site destination, no attributes
OK /html/browsers/history/the-history-interface/traverse_the_history_4.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
- FAIL [expected PASS] subtest: Multiple history traversals, last would be aborted
```
assert_array_equals: Pages opened during history navigation expected property 1 to be 5 but got 3 (expected array [6, 5] got [6, 3])
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- PASS [expected NOTRUN] subtest: Non-HTMLElement should not support autofocus
- TIMEOUT [expected FAIL] subtest: Host element with delegatesFocus should support autofocus
```
Test timed out
```
- NOTRUN [expected FAIL] subtest: Host element with delegatesFocus including no focusable descendants should be skipped
- NOTRUN [expected FAIL] subtest: Area element should support autofocus
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
- TIMEOUT [expected FAIL] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks
```
Test timed out
```
OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
- FAIL [expected PASS] subtest: Meta refresh of the original iframe is not blocked if moved into a sandboxed iframe
```
uncaught exception: Error: assert_unreached: The iframe into which the meta was moved must not refresh Reached unreachable code
```
CRASH [expected OK] /html/semantics/forms/the-fieldset-element/disabled-003.html (#31730, #39631)
OK /navigation-timing/test-navigation-type-reload.html (#33334)
- PASS [expected FAIL] subtest: Reload domComplete > Original domComplete
- PASS [expected FAIL] subtest: Reload domContentLoadedEventStart > Original domContentLoadedEventStart
- PASS [expected FAIL] subtest: Reload domInteractive > Original domInteractive
- PASS [expected FAIL] subtest: Reload fetchStart > Original fetchStart
- PASS [expected FAIL] subtest: Reload loadEventEnd > Original loadEventEnd
- PASS [expected FAIL] subtest: Reload loadEventStart > Original loadEventStart

OK /preload/preload-error.sub.html (#37177)

FAIL [expected PASS] subtest: success (fetch): main

assert_greater_than: http://web-platform.test:8000/preload/resources/dummy.xml?label=fetch should be loaded expected a number greater than 0 but got 0

PASS [expected FAIL] subtest: 404 (fetch): main

OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?26-30 (#38807)
- PASS [expected TIMEOUT] subtest: Navigate a window via form-submission with javascript:-urls in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a window via form-submission with javascript:-urls w/ default policy in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls in enforcing mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.

Stable unexpected results (3)

TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/autoplay-allowed-by-feature-policy.https.sub.html
- TIMEOUT [expected PASS] subtest: Feature-Policy header: autoplay * allows the top-level document.
```
Test timed out
```
- TIMEOUT [expected PASS] subtest: Feature-Policy header: autoplay * allows same-origin iframes.
```
Test timed out
```
TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/autoplay-default-feature-policy.https.sub.html
- TIMEOUT [expected PASS] subtest: Default "autoplay" feature policy ["self"] allows the top-level document.
```
Test timed out
```
- TIMEOUT [expected PASS] subtest: Default "autoplay" feature policy ["self"] allows same-origin iframes.
```
Test timed out
```
TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html
- TIMEOUT [expected PASS] subtest: Feature-Policy header: autoplay "none" has no effect on the top level document.
```
Test timed out
```
- TIMEOUT [expected FAIL] subtest: Feature-Policy header: autoplay "none" disallows same-origin iframes.
```
Test timed out
```

github-actions · 2025-12-08T11:24:28Z

⚠️ Try run (#20025577970) failed.

github-actions · 2025-12-08T13:23:28Z

🔨 Triggering try run (#20029615563) for Linux (WPT)

tharkum · 2025-12-08T13:27:31Z

@rayguo17 < If you is observing some media resource leakage in OHOS media backend it should a little bit helpful ( gstreamer media backend is still buggy)

github-actions · 2025-12-08T13:50:33Z

Test results for linux-wpt from try job (#20029615563):

Flaky unexpected result (33)

OK /IndexedDB/idbfactory_open.any.html
- FAIL [expected PASS] subtest: Calling open() with version argument 1.5 should not throw.
```
assert_equals: version expected 1 but got 9007199254740991
```

OK /_mozilla/css/offset_properties_inline.html (#40543)

FAIL [expected PASS] subtest: offsetTop

assert_equals: offsetTop of #inline-1 should be 0. expected 0 but got -1

FAIL [expected PASS] subtest: offsetLeft

assert_equals: offsetLeft of #inline-2 should be 40. expected 40 but got 25

ERROR [expected OK] /_mozilla/mozilla/img_load_more_than_cache.html
OK /_mozilla/webxr/create_session.https.html
- FAIL [expected PASS] subtest: create_session
```
can't access property "simulateDeviceConnection", navigator.xr.test is undefined
```

OK /_mozilla/webxr/obtain_frame.https.html

FAIL [expected PASS] subtest: obtain_frame

promise_test: Unhandled rejection with value: object "TypeError: can't access property "simulateDeviceConnection", navigator.xr.test is undefined"

ERROR [expected TIMEOUT] /_mozilla/webxr/sessionavailable.https.html
OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #45
- PASS [expected FAIL] subtest: WebGL test #47
- PASS [expected FAIL] subtest: WebGL test #49
- PASS [expected FAIL] subtest: WebGL test #51
- PASS [expected FAIL] subtest: WebGL test #61
- PASS [expected FAIL] subtest: WebGL test #63
- PASS [expected FAIL] subtest: WebGL test #65
- PASS [expected FAIL] subtest: WebGL test #67
OK /content-security-policy/frame-ancestors/frame-ancestors-path-ignored.window.html (#36468)
- FAIL [expected PASS] subtest: A 'frame-ancestors' CSP directive with a URL that includes a path should be ignored.
```
assert_unreached: The IFrame should have been blocked (or cross-origin). It wasn't. Reached unreachable code
```
FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
- PASS [expected FAIL] subtest: Delete layer invalidates @font-face

OK /css/css-ui/text-overflow-023.html (#19861)

FAIL [expected PASS] subtest: Checks hit testing on the ellipsis

assert_equals: the element targeted by a hit on the ellipsis is the elided inline. expected "target" but got "parent"

OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
- PASS [expected FAIL] subtest: Single value - Non-empty name exists
OK [expected TIMEOUT] /fetch/api/redirect/redirect-keepalive.https.any.html (#32153)
- PASS [expected TIMEOUT] subtest: [keepalive][iframe][load] mixed content redirect; setting up
TIMEOUT [expected CRASH] /html/anonymous-iframe/indexeddb.tentative.https.window.html (#39254)
CRASH [expected OK] /html/browsers/browsing-the-web/history-traversal/pagereveal/order-in-new-document-navigation.html
OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html (#28691)
- FAIL [expected PASS] subtest: load event does not fire on window.open('about:blank')
```
assert_unreached: load should not be fired Reached unreachable code
```
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.html (#29049)
- PASS [expected FAIL] subtest: Same-origin navigation started from unload handler must be ignored
OK /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html (#28697)
- PASS [expected FAIL] subtest: aElement.click() before the load event must NOT replace
CRASH [expected OK] /html/canvas/element/canvas-host/2d.canvas.host.size.attributes.setAttribute.whitespace.html
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html (#28259)
- TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with "top" fragments should work.
```
Test timed out
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
- TIMEOUT [expected FAIL] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks
```
Test timed out
```
TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/audio_loop_base.html (#41122)
- NOTRUN [expected PASS] subtest: Check if audio.loop is set to true that expecting the seeking event is fired more than once
OK /html/semantics/forms/form-submission-0/multipart-formdata.window.html (#28725)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in value (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: \n in value (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: backslash in name (formdata event)
OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
- FAIL [expected PASS] subtest: text/plain: Basic File test (normal form)
```
assert_equals: expected "basic=file-test.txt\r\n" but got ""
```
- PASS [expected FAIL] subtest: text/plain: Basic File test (formdata event)
- PASS [expected FAIL] subtest: text/plain: \r\n in name (formdata event)
OK /html/semantics/forms/form-submission-0/urlencoded2.window.html (#28687)
- FAIL [expected PASS] subtest: application/x-www-form-urlencoded: Basic File test (normal form)
```
assert_equals: expected "basic=file-test.txt" but got ""
```
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: Basic File test (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in value (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: single quote in filename (normal form)
CRASH [expected OK] /imagebitmap-renderingcontext/toBlob-origin-clean-offscreen.sub.html
OK /preload/preload-invalid-resources.html (#39091)
- PASS [expected FAIL] subtest: Preloading an invalid image (missing) should preload and not re-fetch
CRASH [expected OK] /trusted-types/Node-multiple-arguments.html
OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?06-10 (#37920)
- PASS [expected TIMEOUT] subtest: Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in enforcing mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in report-only mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
CRASH [expected ERROR] /wasm/webapi/invalid-code.any.sharedworker.html
CRASH [expected OK] /webaudio/the-audio-api/the-audioparam-interface/k-rate-oscillator.html
OK /webdriver/tests/classic/dismiss_alert/dismiss.py (#39098)
- FAIL [expected PASS] subtest: test_dismiss_in_popup_window
```
AssertionError: no such alert (404): No user prompt is currently active.
```
ERROR [expected OK] /workers/baseurl/alpha/import-in-moduleworker.html (#21315)

Stable unexpected results that are known to be intermittent (25)

TIMEOUT /FileAPI/url/url-in-tags-revoke.window.html (#19978)
- TIMEOUT [expected PASS] subtest: Fetching a blob URL immediately before revoking it works in <script> tags.
```
Test timed out
```
OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
OK /_mozilla/mozilla/getBoundingClientRect.html (#39668)
- FAIL [expected PASS] subtest: getBoundingClientRect 1
```
assert_equals: expected 62 but got 60.35
```
FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
- TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo
```
Test timed out
```
OK /css/css-cascade/layer-font-face-override.html (#35935)
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 1
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 2
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
OK /css/css-fonts/generic-family-keywords-001.html (#37467)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(khmer-mul)
```
assert_equals: quoted generic(khmer-mul) matches  @font-face rule expected 30 but got 50
```
OK /css/css-fonts/generic-family-keywords-002.html (#40929)
- PASS [expected FAIL] subtest: font-family: -webkit-serif treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-sans-serif treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-cursive treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-fantasy treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-monospace treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-system-ui treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-math treated as <font-family>, not <generic-name>
- FAIL [expected PASS] subtest: font-family: -webkit-generic(fangsong) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- FAIL [expected PASS] subtest: font-family: -webkit-generic(kai) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- FAIL [expected PASS] subtest: font-family: -webkit-generic(khmer-mul) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- And 12 more unexpected results...
OK /css/css-fonts/generic-family-keywords-003.html (#38994)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted system-ui (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-serif (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-sans-serif (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-rounded (drawing text in a canvas)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-dest
- PASS [expected FAIL] subtest: sec-fetch-user
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Cross-site
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
CRASH [expected OK] /fetch/metadata/generated/element-iframe.https.sub.html (#40341)
OK /fetch/metadata/generated/element-img-environment-change.https.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Same origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Same Origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - attributes: crossorigin
- And 4 more unexpected results...
OK /fetch/metadata/generated/element-img-environment-change.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-site destination, no attributes
ERROR /fetch/metadata/generated/serviceworker.https.sub.html (#36247)
- FAIL [expected PASS] subtest: sec-fetch-site - Same origin, no options - registration
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
ERROR [expected OK] /focus/focus-event-after-switching-iframes.sub.html (#40368)
OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
- FAIL [expected PASS] subtest: Multiple history traversals, last would be aborted
```
assert_array_equals: Pages opened during history navigation expected property 1 to be 5 but got 3 (expected array [6, 5] got [6, 3])
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- TIMEOUT [expected FAIL] subtest: Element with tabindex should support autofocus
```
Test timed out
```
- NOTRUN [expected FAIL] subtest: Host element with delegatesFocus should support autofocus
- NOTRUN [expected FAIL] subtest: Host element with delegatesFocus including no focusable descendants should be skipped
- NOTRUN [expected FAIL] subtest: Area element should support autofocus
TIMEOUT [expected ERROR] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html (#40347)
OK /navigation-timing/test-navigation-type-reload.html (#33334)
- PASS [expected FAIL] subtest: Reload domComplete > Original domComplete
- FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
```
assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false
```
- PASS [expected FAIL] subtest: Reload loadEventEnd > Original loadEventEnd
- PASS [expected FAIL] subtest: Reload loadEventStart > Original loadEventStart

OK /preload/preload-error.sub.html (#37177)

PASS [expected FAIL] subtest: 404 (fetch): main

FAIL [expected PASS] subtest: CORS (fetch): main

assert_greater_than: http://not-web-platform.test:8000/preload/resources/dummy.xml?pipe=header%28Access-Control-Allow-Origin%2C*%29&amp;label=fetch should be loaded expected a number greater than 0 but got 0

OK /resource-timing/buffer-full-add-then-clear.html (#40819)
- PASS [expected FAIL] subtest: Test that if the buffer is cleared after entries were added to the secondary buffer, those entries make it into the primary one
OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?26-30 (#38807)
- PASS [expected TIMEOUT] subtest: Navigate a window via form-submission with javascript:-urls in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a window via form-submission with javascript:-urls w/ default policy in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls in enforcing mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

Stable unexpected results (1)

TIMEOUT /html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html
- TIMEOUT [expected FAIL] subtest: Feature-Policy header: autoplay "none" disallows same-origin iframes.
```
Test timed out
```

github-actions · 2025-12-08T13:50:41Z

⚠️ Try run (#20029615563) failed.

tharkum · 2025-12-08T14:08:42Z

Added missing TIMEOUT test result
TIMEOUT [expected FAIL] subtest: Feature-Policy header: autoplay "none" disallows same-origin iframes.

github-actions · 2025-12-08T14:09:34Z

🔨 Triggering try run (#20030944290) for Linux (WPT)

github-actions · 2025-12-08T14:45:53Z

Test results for linux-wpt from try job (#20030944290):

Flaky unexpected result (35)

OK /IndexedDB/idbfactory_open.any.html
- FAIL [expected PASS] subtest: Calling open() with version argument 1.5 should not throw.
```
assert_equals: version expected 1 but got 9007199254740991
```

OK /_mozilla/css/offset_properties_inline.html (#40543)

FAIL [expected PASS] subtest: offsetTop

assert_equals: offsetTop of #inline-1 should be 0. expected 0 but got -1

FAIL [expected PASS] subtest: offsetLeft

assert_equals: offsetLeft of #inline-2 should be 40. expected 40 but got 25

OK /_mozilla/mozilla/getBoundingClientRect.html (#39668)
- FAIL [expected PASS] subtest: getBoundingClientRect 1
```
assert_equals: expected 62 but got 60.35
```
OK /_mozilla/webxr/create_session.https.html
- FAIL [expected PASS] subtest: create_session
```
can't access property "simulateDeviceConnection", navigator.xr.test is undefined
```

OK /_mozilla/webxr/obtain_frame.https.html

FAIL [expected PASS] subtest: obtain_frame

promise_test: Unhandled rejection with value: object "TypeError: can't access property "simulateDeviceConnection", navigator.xr.test is undefined"

ERROR [expected TIMEOUT] /_mozilla/webxr/sessionavailable.https.html
CRASH [expected OK] /_webgl/conformance2/extensions/webgl-stencil-texturing.html
TIMEOUT /content-security-policy/inheritance/location-reload.html (#38983)
- FAIL [expected PASS] subtest: location.reload() of empty iframe.
```
assert_equals: Image should be blocked by CSP after reload. expected "img blocked" but got "img loaded"
```
FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
OK /css/css-fonts/generic-family-keywords-003.html (#38994)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted system-ui (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(khmer-mul) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-monospace (drawing text in a canvas)
OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
- PASS [expected FAIL] subtest: Single value - Non-empty name exists
- PASS [expected FAIL] subtest: Newline normalization - \r\n in value (formdata)
- PASS [expected FAIL] subtest: Newline normalization - \n in FormData value (formdata)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-mode
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Cross-site
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/window-open.https.sub.html (#40339)
- FAIL [expected PASS] subtest: Same-site window, forced, reloaded
```
The operation is insecure.
```
OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html (#28691)
- FAIL [expected PASS] subtest: load event does not fire on window.open('about:blank')
```
assert_unreached: load should not be fired Reached unreachable code
```
CRASH [expected OK] /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click-during-load.html
CRASH [expected OK] /html/browsers/history/the-history-interface/pushstate-replacestate-empty-string/replacestate.html
OK /html/browsers/history/the-history-interface/traverse_the_history_4.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
CRASH [expected OK] /html/browsers/windows/browsing-context-window.html
CRASH [expected TIMEOUT] /html/canvas/offscreen/layers/2d.layer.global-states.filter.ctx-filter.rotation.tentative.w.html
OK [expected TIMEOUT] /html/semantics/embedded-content/media-elements/src_object_blob.html (#40340)
- PASS [expected TIMEOUT] subtest: HTMLMediaElement.srcObject blob
OK /html/semantics/forms/form-submission-0/jsurl-form-submit.tentative.html (#36489)
- PASS [expected FAIL] subtest: Verifies that form submissions scheduled inside javascript: urls take precedence over the javascript: url's return value.
OK /html/semantics/forms/form-submission-0/multipart-formdata.window.html (#28725)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in value (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: single quote in value (formdata event)
CRASH [expected OK] /html/semantics/forms/the-fieldset-element/disabled-003.html (#31730, #39631)
OK /preload/preload-xhr.html (#39092)
- FAIL [expected PASS] subtest: Make an XHR request immediately after creating link rel=preload.
```
assert_equals: resources/dummy.xml?token=2c10ffd6-8b6b-403f-991b-050d8780870c expected 1 but got 0
```
OK /resource-timing/buffer-full-add-then-clear.html (#40819)
- PASS [expected FAIL] subtest: Test that if the buffer is cleared after entries were added to the secondary buffer, those entries make it into the primary one
ERROR /service-workers/idlharness.https.any.html (#36250)
- PASS [expected TIMEOUT] subtest: ServiceWorkerContainer interface: operation register((TrustedScriptURL or USVString), optional RegistrationOptions)
- PASS [expected TIMEOUT] subtest: NavigationPreloadManager interface: operation enable()
- PASS [expected TIMEOUT] subtest: NavigationPreloadManager interface: operation disable()
- PASS [expected TIMEOUT] subtest: NavigationPreloadManager interface: operation setHeaderValue(ByteString)
- PASS [expected TIMEOUT] subtest: NavigationPreloadManager interface: operation getState()
CRASH [expected OK] /trusted-types/Element-setAttribute-setAttributeNS-sinks.tentative.html
CRASH [expected ERROR] /trusted-types/SharedWorker-importScripts.html
OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?06-10 (#37920)
- PASS [expected TIMEOUT] subtest: Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in enforcing mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in report-only mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
CRASH [expected OK] /wasm/webapi/esm-integration/wasm-to-wasm-link-error.tentative.html
OK /webdriver/tests/classic/element_click/scroll_into_view.py
- FAIL [expected PASS] subtest: test_scroll_into_view
```
webdriver.error.NoSuchElementException: no such element (404)
```
OK /webdriver/tests/classic/element_click/shadow_dom.py
- FAIL [expected PASS] subtest: test_shadow_element_click[host_element]
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/fullscreen_window/from_minimized_window.py
- ERROR [expected FAIL] subtest: test_fullscreen_from_minimized_window
```
setup error: webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

Stable unexpected results that are known to be intermittent (22)

TIMEOUT /FileAPI/url/url-in-tags-revoke.window.html (#19978)
- TIMEOUT [expected PASS] subtest: Fetching a blob URL immediately before revoking it works in <script> tags.
```
Test timed out
```
OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
- TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo
```
Test timed out
```
CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #45
- PASS [expected FAIL] subtest: WebGL test #47
- PASS [expected FAIL] subtest: WebGL test #49
- PASS [expected FAIL] subtest: WebGL test #51
- FAIL [expected PASS] subtest: WebGL test #53
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #55
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #57
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #59
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- PASS [expected FAIL] subtest: WebGL test #61
- PASS [expected FAIL] subtest: WebGL test #63
- And 6 more unexpected results...
OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
- PASS [expected FAIL] subtest: Delete layer invalidates @font-face
OK /css/css-cascade/layer-font-face-override.html (#35935)
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 1
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 2
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
OK /css/css-fonts/generic-family-keywords-001.html (#37467)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(fangsong)
```
assert_equals: quoted generic(fangsong) matches  @font-face rule expected 50 but got 30
```
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(khmer-mul)
```
assert_equals: quoted generic(khmer-mul) matches  @font-face rule expected 50 but got 30
```
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq)
OK /css/css-fonts/generic-family-keywords-002.html (#40929)
- PASS [expected FAIL] subtest: font-family: -webkit-serif treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-sans-serif treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-cursive treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-fantasy treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-monospace treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-system-ui treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-math treated as <font-family>, not <generic-name>
- FAIL [expected PASS] subtest: font-family: -webkit-generic(fangsong) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- FAIL [expected PASS] subtest: font-family: -webkit-generic(kai) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- FAIL [expected PASS] subtest: font-family: -webkit-generic(khmer-mul) treated as <font-family>, not <generic-name>
```
assert_equals: expected 50 but got 30
```
- And 12 more unexpected results...
OK [expected TIMEOUT] /fetch/api/redirect/redirect-keepalive.https.any.html (#32153)
- PASS [expected TIMEOUT] subtest: [keepalive][iframe][load] mixed content redirect; setting up
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy cross-site destination
OK /fetch/metadata/generated/element-img-environment-change.https.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Same origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Same Origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - attributes: crossorigin
- And 4 more unexpected results...
OK /fetch/metadata/generated/element-img-environment-change.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-site destination, no attributes
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
- PASS [expected FAIL] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation
OK /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- PASS [expected NOTRUN] subtest: Non-HTMLElement should not support autofocus

OK /html/webappapis/user-prompts/print-during-unload.html (#35944)

FAIL [expected PASS] subtest: print() during unload

assert_array_equals: expected property 1 to be "destination" but got "error: window.print is not a function" (expected array ["start", "destination"] got ["start", "error: window.print is not a function"])

OK /navigation-timing/test-navigation-type-reload.html (#33334)
- FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
```
assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false
```

OK /preload/preload-error.sub.html (#37177)

FAIL [expected PASS] subtest: success (fetch): main

assert_greater_than: http://web-platform.test:8000/preload/resources/dummy.xml?label=fetch should be loaded expected a number greater than 0 but got 0

OK /preload/preload-invalid-resources.html (#39091)
- PASS [expected FAIL] subtest: Preloading an invalid image (invalid data) should preload and not re-fetch
TIMEOUT [expected OK] /webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.html (#29053)
- TIMEOUT [expected PASS] subtest: StorageKey: test 3P about:blank window opened from a 3P iframe
```
Test timed out
```

github-actions · 2025-12-08T14:46:03Z

✨ Try run (#20030944290) succeeded.

TimvdLippe · 2025-12-08T15:55:34Z

I am not yet sufficiently familiar with memory management to feel comfortable reviewing this PR. I will read along the reviews of others to build up more knowledge in this area.

github-actions · 2025-12-09T09:38:18Z

🔨 Triggering try run (#20058800225) for Linux (WPT)

github-actions · 2025-12-09T10:13:43Z

Test results for linux-wpt from try job (#20058800225):

Flaky unexpected result (34)

TIMEOUT /FileAPI/url/url-in-tags-revoke.window.html (#19978)
- TIMEOUT [expected PASS] subtest: Fetching a blob URL immediately before revoking it works in <script> tags.
```
Test timed out
```
OK /IndexedDB/idbfactory_open.any.html
- FAIL [expected PASS] subtest: Calling open() with version argument 1.5 should not throw.
```
assert_equals: version expected 1 but got 9007199254740991
```

OK /_mozilla/css/offset_properties_inline.html (#40543)

FAIL [expected PASS] subtest: offsetTop

assert_equals: offsetTop of #inline-1 should be 0. expected 0 but got -1

FAIL [expected PASS] subtest: offsetLeft

assert_equals: offsetLeft of #inline-2 should be 40. expected 40 but got 25

ERROR [expected OK] /_mozilla/mozilla/img_find_non_sibling_map.html
OK /_mozilla/webxr/create_session.https.html
- FAIL [expected PASS] subtest: create_session
```
can't access property "simulateDeviceConnection", navigator.xr.test is undefined
```

OK /_mozilla/webxr/obtain_frame.https.html

FAIL [expected PASS] subtest: obtain_frame

promise_test: Unhandled rejection with value: object "TypeError: can't access property "simulateDeviceConnection", navigator.xr.test is undefined"

OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #45
- PASS [expected FAIL] subtest: WebGL test #47
- PASS [expected FAIL] subtest: WebGL test #49
- PASS [expected FAIL] subtest: WebGL test #51
- FAIL [expected PASS] subtest: WebGL test #53
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #55
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #57
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #59
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- PASS [expected FAIL] subtest: WebGL test #61
- PASS [expected FAIL] subtest: WebGL test #63
- And 6 more unexpected results...
TIMEOUT /content-security-policy/inheritance/location-reload.html (#38983)
- FAIL [expected PASS] subtest: location.reload() of empty iframe.
```
assert_equals: Image should be blocked by CSP after reload. expected "img blocked" but got "img loaded"
```
OK /css/css-animations/event-order.tentative.html (#39000)
- PASS [expected FAIL] subtest: Same events on pseudo-elements follow the prescribed order
OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
- PASS [expected FAIL] subtest: Delete layer invalidates @font-face
OK /css/css-cascade/layer-font-face-override.html (#35935)
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 1
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 2
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
OK /css/css-fonts/variations/at-font-face-font-matching.html (#20684)
- FAIL [expected PASS] subtest: Matching font-weight: '399' should prefer '400' over '450 460'
```
assert_equals: Unexpected font on test element expected 487 but got 532
```
TIMEOUT [expected CRASH] /html/anonymous-iframe/indexeddb.tentative.https.window.html (#39254)
CRASH [expected OK] /html/anonymous-iframe/worker-cookies.tentative.https.window.html?worker=dedicated_worker
CRASH [expected OK] /html/browsers/browsing-the-web/navigating-across-documents/005.html (#27062)
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
- PASS [expected FAIL] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation
OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
- FAIL [expected PASS] subtest: Multiple history traversals, last would be aborted
```
assert_array_equals: Pages opened during history navigation expected property 1 to be 5 but got 3 (expected array [6, 5] got [6, 3])
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html (#29087)
- TIMEOUT [expected FAIL] subtest: <dialog>-contained autofocus element gets focused when the dialog is shown
```
Test timed out
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html (#28259)
- TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with empty fragments should work.
```
Test timed out
```
OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html (#39694)
- PASS [expected FAIL] subtest: Meta refresh is blocked by the allow-scripts sandbox flag at its creation time, not when refresh comes due
TIMEOUT /html/semantics/embedded-content/media-elements/autoplay-default-feature-policy.https.sub.html
- PASS [expected TIMEOUT] subtest: Default "autoplay" feature policy ["self"] allows same-origin iframes.

OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-location-replace.html (#32604)

FAIL [expected PASS] subtest: Navigating iframe loading='lazy' before it is loaded: location.replace

uncaught exception: Error: assert_equals: expected "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?nav" but got "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?src"

OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-window-open.html (#32596)

FAIL [expected PASS] subtest: Navigating iframe loading='lazy' before it is loaded: location.replace

uncaught exception: Error: assert_equals: expected "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?nav" but got "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?src"

OK /html/semantics/forms/form-submission-0/multipart-formdata.window.html (#28725)
- FAIL [expected PASS] subtest: multipart/form-data: Basic test (formdata event)
```
assert_equals: expected "\r\nContent-Disposition: form-data; name=\"basic\"\r\n\r\ntest\r\n--\r\n" but got ""
```
- PASS [expected FAIL] subtest: multipart/form-data: single quote in value (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: backslash in name (formdata event)
OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
- FAIL [expected PASS] subtest: text/plain: Basic test (formdata event)
```
assert_equals: expected "basic=test\r\n" but got ""
```
- FAIL [expected PASS] subtest: text/plain: Basic File test (normal form)
```
assert_equals: expected "basic=file-test.txt\r\n" but got ""
```
- PASS [expected FAIL] subtest: text/plain: single quote in value (formdata event)
OK /html/semantics/scripting-1/the-script-element/module/dynamic-import/blob-url.any.html (#33948)
- FAIL [expected PASS] subtest: Revoking a blob URL immediately after calling import will not fail
```
promise_test: Unhandled rejection with value: object "TypeError: Dynamic import failed"
```
CRASH [expected OK] /html/webappapis/dynamic-markup-insertion/opening-the-input-stream/remove-initial-about-blankness.window.html (#28684)

OK /html/webappapis/user-prompts/print-during-unload.html (#35944)

FAIL [expected PASS] subtest: print() during unload

assert_array_equals: expected property 1 to be "destination" but got "error: window.print is not a function" (expected array ["start", "destination"] got ["start", "error: window.print is not a function"])

FAIL [expected PASS] /png/apng/fcTL-dispose-before-region-background.html
OK /preload/prefetch-document.html (#37210)
- FAIL [expected PASS] subtest: different-site document prefetch with 'as=document' should not be consumed
```
assert_equals: expected 2 but got 1
```
CRASH [expected OK] /trusted-types/block-string-assignment-to-DedicatedWorker-setTimeout-setInterval.html
OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?06-10 (#37920)
- PASS [expected TIMEOUT] subtest: Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in enforcing mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in report-only mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
CRASH [expected ERROR] /wasm/webapi/invalid-code.any.sharedworker.html
ERROR [expected OK] /workers/baseurl/alpha/sharedworker-in-worker.html (#21315)

Stable unexpected results that are known to be intermittent (24)

OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()
FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
- TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo
```
Test timed out
```
OK /css/css-fonts/generic-family-keywords-001.html (#37467)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(fangsong)
```
assert_equals: quoted generic(fangsong) matches  @font-face rule expected 50 but got 30
```
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(khmer-mul)
```
assert_equals: quoted generic(khmer-mul) matches  @font-face rule expected 50 but got 30
```
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-dest
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-site destination
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/generated/element-img-environment-change.https.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Same origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Same Origin, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Same-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Site -> Cross-Site, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - attributes: crossorigin
- And 4 more unexpected results...
OK /fetch/metadata/generated/element-img-environment-change.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-origin destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-user - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-site destination, no attributes
ERROR /fetch/metadata/generated/serviceworker.https.sub.html (#36247)
- FAIL [expected PASS] subtest: sec-fetch-site - Same origin, no options - registration
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
ERROR [expected TIMEOUT] /html/browsers/browsing-the-web/history-traversal/pageswap/pageswap-initial-navigation.html (#40387)
OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-iframe-contentWindow.html (#28681)
- FAIL [expected PASS] subtest: load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank'
```
assert_unreached: load should not be fired Reached unreachable code
```
OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html (#28691)
- FAIL [expected PASS] subtest: load event does not fire on window.open('about:blank')
```
assert_unreached: load should not be fired Reached unreachable code
```
OK /html/browsers/history/the-history-interface/traverse_the_history_3.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
OK /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- PASS [expected NOTRUN] subtest: Non-HTMLElement should not support autofocus
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
- TIMEOUT [expected FAIL] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks
```
Test timed out
```
OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
- FAIL [expected PASS] subtest: Meta refresh of the original iframe is not blocked if moved into a sandboxed iframe
```
uncaught exception: Error: assert_unreached: The iframe into which the meta was moved must not refresh Reached unreachable code
```
TIMEOUT [expected ERROR] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html (#40347)
OK /navigation-timing/test-navigation-type-reload.html (#33334)
- FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
```
assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false
```

OK /preload/preload-error.sub.html (#37177)

FAIL [expected PASS] subtest: CORS (fetch): main

assert_greater_than: http://not-web-platform.test:8000/preload/resources/dummy.xml?pipe=header%28Access-Control-Allow-Origin%2C*%29&amp;label=fetch should be loaded expected a number greater than 0 but got 0

OK /resource-timing/buffer-full-add-then-clear.html (#40819)
- PASS [expected FAIL] subtest: Test that if the buffer is cleared after entries were added to the secondary buffer, those entries make it into the primary one
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
TIMEOUT [expected OK] /webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.html (#29053)
- TIMEOUT [expected PASS] subtest: StorageKey: test 3P about:blank window opened from a 3P iframe
```
Test timed out
```
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

github-actions · 2025-12-09T10:13:51Z

✨ Try run (#20058800225) succeeded.

mrobinson

Seems okay, but I am not certain of the safety of sending the WeakRefs across thread boundaries or if there is a better alternative.

mrobinson · 2025-12-09T14:16:02Z

components/script/dom/html/htmlmediaelement.rs

+#[expect(unsafe_code)]
+unsafe impl Send for HTMLMediaElementEventHandler {}


I'm actually not sure if it is safe to send a DOM WeakRef across thread boundaries. I think this is a question for @jdm.

Sending a DOM WeakRef across thread boundaries is not safe by itself, but with the fine-granted usage of a Arc<T> ownership + Weak<T> upgrade (inside the IPC callback's queued task on the script thread) give to us this safety.
If in future someone decide to change it, the assert inside HTMLMediaElementEventHandler::drop will notify about broken safety.

Yeah, this is a pattern that it may make sense to generalize in the future if other DOM types need weak references from other threads.

components/script/dom/html/htmlmediaelement.rs

mrobinson · 2025-12-09T14:19:23Z

components/script/dom/html/htmlmediaelement.rs

    audio_renderer: DomRefCell<Option<Arc<Mutex<dyn AudioRenderer>>>>,
+    #[conditional_malloc_size_of]
+    #[no_trace]
+    event_handler: RefCell<Option<Arc<Mutex<HTMLMediaElementEventHandler>>>>,


Maybe a OnceCell makes more sense here?

More suitable here Cell<T> but T is not copyable type and MallocSizeOf trait bound is not satisfied, so RefCell will be used.

And yes lazy OnceCell could be used here as well but the point is to drop WeakRef as soon as possible (on new media source loading with possible source selection error) and do not preserve it till the end when the media element will be GC-ed.

Added new invokation struct `HTMLMediaElementEventHandler` that allows to decouple ownership of the `HTMLMediaElement` from the IPC router callback (break cyclic referrence dependency) by replacing a `Trusted` wrapper with more suitable `WeakRef`. Note that `WeakRef` is not thread-safe and MUST be rooted and/or deleted on the script thread. Testing: Regressions in the following tests caused by overly aggressive GC on document activity change to `Inactive` and will be follow up in servo#41138 - html/semantics/embedded-content/media-elements/autoplay-allowed-by-feature-policy.https.sub.html - html/semantics/embedded-content/media-elements/autoplay-default-feature-policy.https.sub.html - html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html Fixes: servo#40243 Signed-off-by: Andrei Volykhin <[email protected]>

tharkum · 2025-12-10T06:29:23Z

Seems okay, but I am not certain of the safety of sending the WeakRefs across thread boundaries or if there is a better alternative.

The better alternative (per my opinion) is to add another invocation level to remove dancing around these Trusted/WeakRef references to the HTMLMediaElement but that will require more work.

AS_IS: HTMLMediaElement -> HTMLMediaElementFetchContext/FetchListener/EventHandler + servo_media::Player

TO_BE: HTMLMediaElement -> MediaPlayer -> MediaPlayerFetchContext/FetchListener/EventHandler + servo_media::Player

Note that a HTMLMediaElementFetchListener holds a Trusted reference to HTMLMediaElement, so if a media source will be too big and loading is very slow - the media element couldn't be GC-ed during all loading time from network...

tharkum · 2025-12-10T14:22:33Z

@jdm < Please review and add to merge queue if PR is OK.

tharkum force-pushed the html-media-decouple-ownership branch from 9e85d5e to 4fa829f Compare December 8, 2025 10:43

tharkum added the T-linux-wpt Do a try run of the WPT label Dec 8, 2025

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tharkum mentioned this pull request Dec 8, 2025

Make GC for document with Inactive activity state less aggressive #41138

Open

tharkum force-pushed the html-media-decouple-ownership branch from 4fa829f to 8c4e035 Compare December 8, 2025 13:14

tharkum marked this pull request as ready for review December 8, 2025 13:15

tharkum requested a review from gterzian as a code owner December 8, 2025 13:15

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Dec 8, 2025

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tharkum force-pushed the html-media-decouple-ownership branch from 8c4e035 to efd92da Compare December 8, 2025 14:08

tharkum added the T-linux-wpt Do a try run of the WPT label Dec 8, 2025

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tharkum assigned mrobinson, jdm, TimvdLippe and xiaochengh Dec 8, 2025

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tharkum unassigned mrobinson, jdm and xiaochengh Dec 9, 2025

tharkum requested review from jdm, mrobinson and xiaochengh December 9, 2025 08:43

tharkum force-pushed the html-media-decouple-ownership branch from efd92da to 228af82 Compare December 9, 2025 09:37

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mrobinson reviewed Dec 9, 2025

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tharkum force-pushed the html-media-decouple-ownership branch from 228af82 to 08499cc Compare December 10, 2025 05:37

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servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Dec 10, 2025

mrobinson changed the title ~~html: Decouple ownership of the media element from IPC router callback~~ script: Decouple ownership of the media element from IPC router callback Dec 10, 2025

jdm added this pull request to the merge queue Dec 10, 2025

servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Dec 10, 2025

Merged via the queue into servo:main with commit 807979b Dec 10, 2025
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servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Dec 10, 2025

tharkum deleted the html-media-decouple-ownership branch December 10, 2025 16:02

		#[expect(unsafe_code)]
		unsafe impl Send for HTMLMediaElementEventHandler {}

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