css: Make animation faster, direction-aware and more robust at endpoints by yezhizhen · Pull Request #44365 · servo/servo

yezhizhen · 2026-04-20T04:47:48Z

Testing: New passes in existing tests: revert-rule, css-easing, css-logical.
revert-rule seems to be one of latest CSS keywords. I cannot even find it in MDN.

Fixes: #43086

I'm unable to reopen the previous PR #43594.

github-actions · 2026-04-20T04:48:21Z

🔨 Triggering try run (#24648950322) for Linux (WPT)

github-actions · 2026-04-20T05:19:39Z

Test results for linux-wpt from try job (#24648950322):

Flaky unexpected result (36)

CRASH [expected OK] /_webgl/conformance2/wasm/readpixels-2gb-in-4gb-wasm-memory.html
FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
- FAIL [expected PASS] subtest: Delete layer invalidates @font-face
```
assert_equals: expected "220px" but got "133px"
```
OK /css/css-cascade/layer-font-face-override.html (#35935)
- PASS [expected FAIL] subtest: @font-face override update with appended sheet 1
- PASS [expected FAIL] subtest: @font-face override update with appended sheet 2
OK /css/css-fonts/variations/at-font-face-font-matching.html (#20684)
- FAIL [expected PASS] subtest: Matching font-style: 'oblique 20deg' should prefer 'oblique 10deg' over 'oblique 0deg'
```
assert_equals: Unexpected font on test element expected 487 but got 532
```
FAIL [expected PASS] /css/css-ui/webkit-appearance-searchfield-001.html
CRASH [expected OK] /fetch/api/cors/cors-preflight-not-cors-safelisted.any.html
CRASH [expected OK] /fetch/api/headers/headers-no-cors.any.worker.html
ERROR [expected OK] /fetch/metadata/window-open.https.sub.html (#40339)
OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html (#28691)
- PASS [expected FAIL] subtest: load event does not fire on window.open('about:blank')
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

OK [expected TIMEOUT] /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-requestsubmit.html (#44098)

FAIL [expected TIMEOUT] subtest: Replace before load, triggered by formElement.requestSubmit()

assert_equals: expected "http://web-platform.test:8000/common/blank.html?thereplacement=" but got "http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/resources/code-injector.html?pipe=sub(none)&amp;code=%0A%20%20%20%20const%20form%20%3D%20document.createElement(%22form%22)%3B%0A%20%20%20%20form.action%20%3D%20%22%2Fcommon%2Fblank.html%22%3B%0A%0A%20%20%20%20const%20input%20%3D%20document.createElement(%22input%22)%3B%0A%20%20%20%20input.type%20%3D%20%22hidden%22%3B%0A%20%20%20%20input.name%20%3D%20%22thereplacement%22%3B%0A%20%20%20%20form.append(input)%3B%0A%0A%20%20%20%20document.currentScript.before(form)%3B%0A%20%20%20%20form.requestSubmit()%3B%0A%20%20"

OK [expected TIMEOUT] /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit.html (#44028)
OK /html/browsers/history/the-history-interface/traverse_the_history_2.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
CRASH [expected OK] /html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.incomplete.emptysrc.html
OK [expected 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
- FAIL [expected NOTRUN] subtest: Speed-ups should change the pitch when preservesPitch=false
```
assert_approx_equals: The actual pitch should be close to the expected pitch. expected 880 +/- 132 but got 431.0850439882698
```
- FAIL [expected NOTRUN] subtest: Slow-downs should change the pitch when preservesPitch=false
```
assert_approx_equals: The actual pitch should be close to the expected pitch. expected 220 +/- 33 but got 431.0850439882698
```
TIMEOUT [expected OK] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigate_other_frame_popup.sub.html (#39702)
- TIMEOUT [expected FAIL] subtest: Sandboxed iframe can not navigate other frame's popup
```
Test timed out
```
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.
CRASH [expected FAIL] /html/semantics/interestfor/interestfor-plain-inline-element.tentative.html
OK /html/webappapis/dynamic-markup-insertion/document-write/module-dynamic-import.html
- FAIL [expected PASS] subtest: document.write in an imported module
```
assert_true: onload must be called expected true got false
```
OK /html/webappapis/dynamic-markup-insertion/document-write/module-tla-import.html (#42419)
- FAIL [expected PASS] subtest: document.write in an imported module
```
assert_true: onload must be called expected true got false
```
CRASH [expected OK] /html/webappapis/system-state-and-capabilities/the-navigator-object/secure_context.html
OK [expected TIMEOUT] /infrastructure/testdriver/click_nested.html (#43887)
- FAIL [expected NOTRUN] subtest: TestDriver click method with multiple windows and nested iframe
```
can't access property "document", child.frames[2] is undefined
```
OK /mixed-content/tentative/autoupgrades/mixed-content-cors.https.sub.html (#41123)
- PASS [expected FAIL] subtest: Cross-Origin video should get upgraded even if CORS is set
PASS [expected FAIL] /png/apng/fcTL-dispose-none.html (#41817)
OK /resource-timing/test_resource_timing.html (#25720)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
OK /touch-events/single-tap-when-touchend-listener-use-sync-xhr.html (#41175)
- PASS [expected FAIL] subtest: Click event should be fired when touchend opens synchronous XHR
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.
OK /visual-viewport/resize-event-order.html (#41981)
- PASS [expected FAIL] subtest: Popup: DOMWindow resize fired before VisualViewport.
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)
ERROR [expected OK] /workers/baseurl/alpha/sharedworker-in-worker.html (#21315)
CRASH [expected OK] /workers/constructors/Worker/use-base-url.html

Stable unexpected results that are known to be intermittent (17)

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)

FAIL [expected PASS] subtest: WebGL test #45

assert_true: Texture was smaller than the expected size 2x2 expected true got false

FAIL [expected PASS] subtest: WebGL test #47

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 #49

assert_true: Texture was smaller than the expected size 2x2 expected true got false

FAIL [expected PASS] subtest: WebGL test #51

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 #53
PASS [expected FAIL] subtest: WebGL test #55
PASS [expected FAIL] subtest: WebGL test #57
PASS [expected FAIL] subtest: WebGL test #59

FAIL [expected PASS] subtest: WebGL test #61

assert_true: Texture was smaller than the expected size 2x2 expected true got false

FAIL [expected PASS] subtest: WebGL test #63

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

And 10 more unexpected results...

ERROR /_webgl/conformance2/textures/misc/tex-3d-size-limit.html (#44280)
- PASS [expected FAIL] subtest: WebGL test #36
- PASS [expected FAIL] subtest: WebGL test #37
- PASS [expected FAIL] subtest: WebGL test #39
- PASS [expected FAIL] subtest: WebGL test #40
- PASS [expected FAIL] subtest: WebGL test #41
- PASS [expected FAIL] subtest: WebGL test #44
- FAIL [expected PASS] subtest: WebGL test #77
```
assert_true: successfullyParsed should be true (of type boolean). Was undefined (of type undefined). expected true got false
```
OK [expected CRASH] /content-security-policy/meta/sandbox-iframe.html (#43478)
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
```
OK /css/css-fonts/generic-family-keywords-003.html (#38994)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted cursive (drawing text in a canvas)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted fantasy (drawing text in a canvas)
```
assert_equals: quoted fantasy matches  @font-face rule expected 125 but got 40
```
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai) (drawing text in a canvas)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted ui-sans-serif (drawing text in a canvas)
```
assert_equals: unquoted ui-sans-serif does not match @font-face rule expected 40 but got 125
```
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Cross-site
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
TIMEOUT /fetch/metadata/generated/css-images.https.sub.tentative.html (#42229)
- FAIL [expected PASS] subtest: content sec-fetch-site - Same-Origin -> Same Origin
```
assert_unreached: Reached unreachable code
```
OK [expected ERROR] /focus/focus-event-after-switching-iframes.sub.html (#40368)
TIMEOUT [expected OK] /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-submit-button-click.html (#44099)
- TIMEOUT [expected FAIL] subtest: Replace before load, triggered by submitButton.click()
```
Test timed out
```
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])
```
CRASH [expected TIMEOUT] /html/browsers/history/the-location-interface/location_replace_session_history.html (#41896)
TIMEOUT /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- TIMEOUT [expected PASS] subtest: Non-HTMLElement should not support autofocus
```
Test timed out
```
- NOTRUN [expected FAIL] subtest: Host element with delegatesFocus should support autofocus
OK /navigation-timing/test-navigation-type-reload.html (#33334)
- PASS [expected FAIL] subtest: Reload domInteractive > Original domInteractive
OK /resource-timing/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
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.
OK /trusted-types/trusted-types-reporting.html (#43737)
- PASS [expected FAIL] subtest: Trusted Type violation report: creating a forbidden-but-not-reported policy.
- PASS [expected FAIL] subtest: Trusted Type violation report: sample for SVGScriptElement href assignment by setAttribute
- PASS [expected FAIL] subtest: Trusted Type violation report: Worker constructor

Stable unexpected results (1)

OK /css/css-animations/revert-rule-keyframes.html
- PASS [expected FAIL] subtest: revert-rule in keyframes (width)
- PASS [expected FAIL] subtest: revert-rule in keyframes (--x)

github-actions · 2026-04-20T05:19:46Z

⚠️ Try run (#24648950322) failed!

yezhizhen · 2026-04-20T05:21:52Z

We are getting more passing than previously too, for the revert-rule keyframes test: /css/css-animations/revert-rule-keyframes.html,
combined with recently merged keyframe improvement from @simonwuelker :)

simonwuelker · 2026-04-20T08:06:37Z

In the stylo PR you state

we exit early to avoid division‑by‑zero in percentage_between_keyframes

Can you add a test for this?

yezhizhen · 2026-04-20T08:26:13Z

In the stylo PR you state

we exit early to avoid division‑by‑zero in percentage_between_keyframes

Can you add a test for this?

This is covered by existing test. If I don't do that, one test get something like 17895697.05px before.

simonwuelker · 2026-04-20T08:54:36Z

CI has debug assertions enabled though, so I'd expect a division by zero to cause a crash no?

yezhizhen · 2026-04-20T09:32:01Z

CI has debug assertions enabled though, so I'd expect a division by zero to cause a crash no?

There is no debug assertion for division by 0 branch. The only debug assertion I added is that next_keyframe_index must be Some.

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

github-actions · 2026-05-01T08:41:12Z

🔨 Triggering try run (#25208387939) for Linux (WPT)

github-actions · 2026-05-01T09:13:00Z

Test results for linux-wpt from try job (#25208387939):

Flaky unexpected result (24)

OK /IndexedDB/idbdatabase_deleteObjectStore.any.worker.html (#43776)
- FAIL [expected PASS] subtest: Deleted object store's name should be removed from database's list. Attempting to use a deleted IDBObjectStore should throw an InvalidStateError
```
assert_unreached: rq_add.error (DataError) Reached unreachable code
```
CRASH [expected OK] /_webgl/conformance/context/context-type-test.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
- 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...
CRASH [expected OK] /content-security-policy/meta/sandbox-iframe.html (#43478)
FAIL [expected PASS] /css/css-backgrounds/background-size-041.html
OK /css/css-fonts/generic-family-keywords-002.html (#40929)
- FAIL [expected PASS] subtest: font-family: -webkit-serif treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-sans-serif treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-cursive treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-fantasy treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-monospace treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-system-ui treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-math treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- PASS [expected FAIL] subtest: font-family: -webkit-generic(fangsong) treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-generic(kai) treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-generic(khmer-mul) treated as <font-family>, not <generic-name>
- And 12 more unexpected results...
CRASH [expected OK] /fetch/api/cors/cors-preflight-not-cors-safelisted.any.html
CRASH [expected OK] /fetch/api/policies/referrer-origin-when-cross-origin-worker.html
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/sandboxed-iframe.https.window.html (#41704)
TIMEOUT /fetch/metadata/generated/css-images.sub.tentative.html (#29047)
- TIMEOUT [expected PASS] subtest: background-image sec-fetch-mode - Not sent to non-trustworthy same-site destination
```
Test timed out
```
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
- FAIL [expected PASS] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation
```
assert_equals: expected "" but got "#fragment"
```
CRASH [expected OK] /html/browsers/history/the-history-interface/combination_history_001.html
OK /html/browsers/windows/embedded-opener-remove-frame.html (#23867)
- PASS [expected FAIL] subtest: opener of discarded auxiliary browsing context
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
```
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/scripting-1/the-script-element/module/dynamic-import/blob-url.any.worker.html (#33909)
- PASS [expected FAIL] subtest: Revoking a blob URL immediately after calling import will not fail
TIMEOUT [expected OK] /html/user-activation/navigation-state-reset-sameorigin.html
- TIMEOUT [expected PASS] subtest: Post-navigation state reset.
```
Test timed out
```
OK /html/webappapis/dynamic-markup-insertion/document-write/module-dynamic-import.html
- FAIL [expected PASS] subtest: document.write in an imported module
```
assert_true: onload must be called expected true got false
```
FAIL [expected PASS] /png/apng/fcTL-dispose-previous-final.html (#41837)
TIMEOUT [expected OK] /pointerevents/compat/pointerevent_touch-action_two-finger_interaction.html
- NOTRUN [expected PASS] subtest: touch two-finger pan on 'touch-action: pan-x pan-y'
- NOTRUN [expected FAIL] subtest: touch two-finger pan on 'touch-action: pinch-zoom'
OK /sanitizer-api/sanitizer-inert-document.tentative.html (#44273)
- PASS [expected FAIL] subtest: Test whether setHTMLUnsafe loads the image.
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?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.
- TIMEOUT [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
```
Test timed out
```
OK [expected TIMEOUT] /webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.html (#29053)
- FAIL [expected TIMEOUT] subtest: StorageKey: test 3P about:blank window opened from a 3P iframe
```
assert_true: about:blank window opened by 3P iframe does not inherit 3P iframe's StorageKey expected true got false
```

Stable unexpected results that are known to be intermittent (21)

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)
- PASS [expected FAIL] subtest: @font-face override update with appended sheet 1
- PASS [expected FAIL] subtest: @font-face override update with appended sheet 2
OK /css/css-fonts/generic-family-keywords-001.html (#37467)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(kai)
```
assert_equals: quoted generic(kai) matches  @font-face rule expected 30 but got 50
```
- 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
```
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(nastaliq)
```
assert_equals: quoted generic(nastaliq) matches  @font-face rule expected 30 but got 50
```
OK /css/css-fonts/generic-family-keywords-003.html (#38994)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted cursive (drawing text in a canvas)
```
assert_equals: quoted cursive matches  @font-face rule expected 125 but got 40
```
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted system-ui (drawing text in a canvas)
```
assert_equals: quoted system-ui matches  @font-face rule expected 125 but got 40
```
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted math (drawing text in a canvas)
```
assert_equals: unquoted math does not match @font-face rule expected 40 but got 125
```
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai) (drawing text in a canvas)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted ui-serif (drawing text in a canvas)
```
assert_equals: quoted ui-serif matches  @font-face rule expected 125 but got 40
```
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/empty-payload.https.window.html (#35176)
- PASS [expected FAIL] subtest: fetchLater() accepts an empty POST request body of String in same-origin iframe.
- PASS [expected FAIL] subtest: fetchLater() accepts an empty POST request body of ArrayBuffer in same-origin iframe.
- PASS [expected FAIL] subtest: fetchLater() accepts an empty POST request body of URLSearchParams in same-origin iframe.
- PASS [expected FAIL] subtest: fetchLater() accepts an empty POST request body of Blob in same-origin iframe.
- PASS [expected FAIL] subtest: fetchLater() accepts an empty POST request body of File in same-origin iframe.
ERROR [expected OK] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- FAIL [expected PASS] subtest: sec-fetch-mode
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-dest
TIMEOUT /fetch/metadata/generated/css-images.https.sub.tentative.html (#42229)
- PASS [expected FAIL] subtest: content sec-fetch-site - Same-Origin -> Same Origin
OK [expected ERROR] /focus/focus-event-after-switching-iframes.sub.html (#40368)
OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/iframe-src-204.html (#44521)
- PASS [expected FAIL] subtest: Navigating to a different document with link click

OK [expected TIMEOUT] /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/form-requestsubmit.html (#44098)

FAIL [expected TIMEOUT] subtest: Replace before load, triggered by formElement.requestSubmit()

assert_equals: expected "http://web-platform.test:8000/common/blank.html?thereplacement=" but got "http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/resources/code-injector.html?pipe=sub(none)&amp;code=%0A%20%20%20%20const%20form%20%3D%20document.createElement(%22form%22)%3B%0A%20%20%20%20form.action%20%3D%20%22%2Fcommon%2Fblank.html%22%3B%0A%0A%20%20%20%20const%20input%20%3D%20document.createElement(%22input%22)%3B%0A%20%20%20%20input.type%20%3D%20%22hidden%22%3B%0A%20%20%20%20input.name%20%3D%20%22thereplacement%22%3B%0A%20%20%20%20form.append(input)%3B%0A%0A%20%20%20%20document.currentScript.before(form)%3B%0A%20%20%20%20form.requestSubmit()%3B%0A%20%20"

TIMEOUT /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- FAIL [expected TIMEOUT] subtest: Element with tabindex should support autofocus
```
assert_equals: expected "SPAN" but got "BODY"
```
- PASS [expected NOTRUN] subtest: Non-HTMLElement should not support autofocus
- FAIL [expected NOTRUN] subtest: Host element with delegatesFocus should support autofocus
```
assert_equals: expected Element node &lt;div autofocus=""&gt;&lt;/div&gt; but got Element node &lt;body&gt;&lt;div autofocus=""&gt;&lt;/div&gt;&lt;/body&gt;
```
- TIMEOUT [expected NOTRUN] subtest: Host element with delegatesFocus including no focusable descendants should be skipped
```
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
```
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
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
```
OK /html/semantics/embedded-content/media-elements/seeking/seek-to-max-value.htm (#40626)
- PASS [expected FAIL] subtest: seek to Number.MAX_VALUE
TIMEOUT [expected OK] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigate_other_frame_popup.sub.html (#39702)
- TIMEOUT [expected FAIL] subtest: Sandboxed iframe can not navigate other frame's popup
```
Test timed out
```
OK /navigation-timing/test-navigation-type-reload.html (#33334)
- FAIL [expected PASS] subtest: Reload domComplete > Original domComplete
```
assert_true: Reload domComplete &gt; Original domComplete expected true got false
```
- FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
```
assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false
```
- FAIL [expected PASS] subtest: Reload domContentLoadedEventStart > Original domContentLoadedEventStart
```
assert_true: Reload domContentLoadedEventStart &gt; Original domContentLoadedEventStart expected true got false
```
- FAIL [expected PASS] subtest: Reload loadEventEnd > Original loadEventEnd
```
assert_true: Reload loadEventEnd &gt; Original loadEventEnd expected true got false
```
- FAIL [expected PASS] subtest: Reload loadEventStart > Original loadEventStart
```
assert_true: Reload loadEventStart &gt; Original loadEventStart expected true got false
```
OK /resource-timing/buffer-full-when-populate-entries.html (#44408)
- FAIL [expected PASS] subtest: Test that a buffer full event does not bubble and that resourcetimingbufferfull is called only once per overflow
```
assert_equals: onresourcetimingbufferfull should have been invoked once. expected 1 but got 0
```
OK /resource-timing/test_resource_timing.html (#25720)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (iframe)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)
OK /trusted-types/trusted-types-reporting.html (#43737)
- PASS [expected FAIL] subtest: Trusted Type violation report: sample for SVGScriptElement href assignment by setAttribute
- PASS [expected FAIL] subtest: Trusted Type violation report: sample for eval
- PASS [expected FAIL] subtest: Trusted Type violation report: sample for custom element assignment
- PASS [expected FAIL] subtest: Trusted Type violation report: Worker constructor

github-actions · 2026-05-01T09:13:14Z

✨ Try run (#25208387939) succeeded.

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Apr 20, 2026

yezhizhen requested a review from xiaochengh April 20, 2026 04:48

yezhizhen added the T-linux-wpt Do a try run of the WPT label Apr 20, 2026

github-actions Bot removed the T-linux-wpt Do a try run of the WPT label Apr 20, 2026

yezhizhen marked this pull request as draft April 20, 2026 05:12

yezhizhen mentioned this pull request Apr 20, 2026

Fix CSS step timing functions jump-both, jump-start, start at timestamp 0; Early return when possible servo/stylo#354

Open

yezhizhen marked this pull request as ready for review April 20, 2026 05:20

yezhizhen requested a review from Loirooriol April 20, 2026 05:35

yezhizhen force-pushed the replace branch from 01d2613 to 54fe779 Compare May 1, 2026 06:54

yezhizhen added 3 commits May 1, 2026 16:36

updatw wpt

11266e3

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

More test improvement for reversed direction

7e21823

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

Update deps

ab3f7c7

Signed-off-by: Euclid Ye <yezhizhenjiakang@gmail.com>

yezhizhen force-pushed the replace branch from 54fe779 to ab3f7c7 Compare May 1, 2026 08:40

yezhizhen added the T-linux-wpt Do a try run of the WPT label May 1, 2026

github-actions Bot removed the T-linux-wpt Do a try run of the WPT label May 1, 2026

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css: Make animation faster, direction-aware and more robust at endpoints#44365

css: Make animation faster, direction-aware and more robust at endpoints#44365
yezhizhen wants to merge 3 commits intoservo:mainfrom
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