layout: Remove box damage for parent when we can reuse the box by Loirooriol · Pull Request #42847 · servo/servo

Loirooriol · 2026-02-25T12:27:02Z

This fixes an oversight from #42783: when detecting that a box can be reused, we weren't clearing the box damage propagated to ancestors, so ancestors were still recollecting children.

This exposed some problems in rebuild_box_tree_from_independent_formatting_context():

When reusing a block-level box that established an independent formatting context, we weren't checking that the new style was still block-level.
When reusing a block-level abspos box, we weren't checking if the new original display was inline-level, preventing it from being handled as a block-level because of the static position.
When reusing a flex item, we weren't checking if the order had changed.

Testing: we have test coverage for the 3 problems above:

Covered by /html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-display.html, and also adding a new /css/css-display/display-flow-root-dynamic.html.
Covered by /css/CSS2/abspos/hypothetical-box-dynamic.html
Covered by /css/css-display/order-dynamic.html.

github-actions · 2026-02-25T12:34:53Z

🔨 Triggering try run (#22396819828) for Linux (WPT)

github-actions · 2026-02-25T13:33:29Z

Test results for linux-wpt from try job (#22396819828):

Flaky unexpected result (27)

OK /FileAPI/url/url-with-fetch.any.html (#21517)
- FAIL [expected PASS] subtest: Revoke blob URL after calling fetch, fetch should succeed
```
promise_test: Unhandled rejection with value: object "TypeError: Network error: Blob URL store error: InvalidFileID"
```
OK [expected TIMEOUT] /IndexedDB/idbfactory_open.any.worker.html
- PASS [expected FAIL] subtest: Calling open() with version argument 1.5 should not throw.
- PASS [expected TIMEOUT] subtest: Calling open() with version argument 9007199254740991 should not throw.
- PASS [expected TIMEOUT] subtest: Calling open() with version argument undefined should not throw.
FAIL [expected PASS] /_mozilla/css/image_percentage_height.html

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 /content-security-policy/frame-ancestors/frame-ancestors-path-ignored.window.html (#36468)
- PASS [expected FAIL] subtest: A 'frame-ancestors' CSP directive with a URL that includes a path should be ignored.
FAIL [expected PASS] /css/css-backgrounds/background-size-041.html
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-003.html (#38994)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted cursive (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted monospace (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(fangsong) (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)
FAIL [expected PASS] /css/css-ui/appearance-menulist-button-001.html
TIMEOUT [expected OK] /fetch/api/redirect/redirect-keepalive.https.any.html (#32153)
- TIMEOUT [expected PASS] subtest: [keepalive][iframe][load] mixed content redirect; setting up
```
Test timed out
```
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/navigation-unload-cross-origin.sub.window.html (#29056)
- PASS [expected FAIL] subtest: Cross-origin navigation started from unload handler must be ignored
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)

FAIL [expected PASS] subtest: aElement.click() before the load event must NOT replace

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%20a%20%3D%20document.createElement(%22a%22)%3B%0A%20%20%20%20a.href%20%3D%20%22%2Fcommon%2Fblank.html%3Fthereplacement%22%3B%0A%20%20%20%20document.currentScript.before(a)%3B%0A%20%20%20%20a.click()%3B%0A%20%20"

OK /html/browsers/windows/embedded-opener-remove-frame.html (#23867)

FAIL [expected PASS] subtest: opener of discarded auxiliary browsing context

assert_object_equals: property "get" expected function "function opener() {
    [native code]
}" got function "function opener() {
    [native code]
}"

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/forms/form-submission-0/form-submit-iframe-then-location-navigate.html (#29634)
- PASS [expected FAIL] subtest: Verifies that location navigations take precedence when following form submissions.
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/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
```
FAIL [expected PASS] /png/apng/fcTL-blend-source-solid.html (#41560)
FAIL [expected PASS] /png/apng/fcTL-dispose-previous.html (#41561)
OK /preload/link-header-preload-delay-onload.html (#39622)
- FAIL [expected PASS] subtest: Makes sure that Link headers preload resources and block window.onload after resource discovery
```
assert_true: expected true got false
```
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
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!\""
```
OK /webdriver/tests/classic/take_screenshot/iframe.py
- ERROR [expected PASS] subtest: test_always_captures_top_browsing_context
```
setup error: ConnectionRefusedError: [Errno 111] Connection refused
```
- ERROR [expected PASS] subtest: test_source_origin[same_origin]
```
setup error: ConnectionRefusedError: [Errno 111] Connection refused
```
- ERROR [expected PASS] subtest: test_source_origin[cross_origin]
```
setup error: ConnectionRefusedError: [Errno 111] Connection refused
```
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

Stable unexpected results that are known to be intermittent (19)

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/transaction-scheduling-mixed-scopes.any.html (#42753)
- PASS [expected FAIL] subtest: Check that scope restrictions on mixed transactions are enforced.
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 /beacon/beacon-basic.https.window.html (#41723)
- PASS [expected FAIL] subtest: Payload size restriction should be accumulated: type = string
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(fangsong)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(kai)
```
assert_equals: quoted generic(kai) matches  @font-face rule expected 50 but got 30
```
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy cross-site destination
ERROR /fetch/metadata/generated/serviceworker.https.sub.html (#36247)
- PASS [expected FAIL] subtest: sec-fetch-site - Same origin, no options - registration
OK [expected ERROR] /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)
- 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 [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html (#29087)
- FAIL [expected TIMEOUT] subtest: <dialog>-contained autofocus element gets focused when the dialog is shown
```
promise_test: Unhandled rejection with value: object "TypeError: can't access property "show", w.document.querySelector(...) is null"
```

OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)

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;/body&gt;

FAIL [expected NOTRUN] subtest: Host element with delegatesFocus including no focusable descendants should be skipped

assert_equals: expected Element node &lt;input autofocus=""&gt;&lt;/input&gt; but got Element node &lt;body&gt;&lt;div autofocus=""&gt;&lt;/div&gt;&lt;input autofocus=""&gt;&lt;/body&gt;

FAIL [expected NOTRUN] subtest: Area element should support autofocus

promise_test: Unhandled rejection with value: object "TypeError: can't access property "appendChild", w.document.querySelector(...) is null"

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 /html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html (#41221)
- FAIL [expected TIMEOUT] subtest: Feature-Policy header: autoplay "none" disallows same-origin iframes.
```
assert_false: autoplay expected false got true
```
OK /html/semantics/scripting-1/the-script-element/execution-timing/077.html (#22139)
- PASS [expected FAIL] subtest: adding several types of scripts through the DOM and removing some of them confuses scheduler
OK /resource-timing/buffer-full-add-then-clear.html (#40819)
- FAIL [expected PASS] subtest: Test that if the buffer is cleared after entries were added to the secondary buffer, those entries make it into the primary one
```
assert_equals: Number of entries does not match the expected value. expected 3 but got 0
```
OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?01-05 (#38975)
- PASS [expected TIMEOUT] subtest: Navigate a window via anchor with javascript:-urls in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ default policy in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via anchor with javascript:-urls 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
```

Stable unexpected results (4)

ERROR [expected CRASH] /_webgl/conformance2/textures/misc/tex-3d-size-limit.html

PASS [expected FAIL] subtest: WebGL test #1

FAIL [expected PASS] subtest: WebGL test #3

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #4

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #5

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #6

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #7

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #8

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #9

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #10

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

FAIL [expected PASS] subtest: WebGL test #11

assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : texImage3D should fail for dimension out of range. expected true got false

And 27 more unexpected results...

FAIL [expected PASS] /css/CSS2/abspos/hypothetical-box-dynamic.html
FAIL [expected PASS] /css/css-display/order-dynamic.html
OK /html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-display.html
- PASS [expected FAIL] subtest: rendered legend with display: inline-grid
- PASS [expected FAIL] subtest: rendered legend with display: inline-flex
- PASS [expected FAIL] subtest: rendered legend with display: inline-grid; overflow:hidden
- PASS [expected FAIL] subtest: rendered legend with display: inline-flex; overflow:hidden
- PASS [expected FAIL] subtest: rendered legend with display: inline-block; columns:1
- PASS [expected FAIL] subtest: rendered legend with display: inline-grid; columns:1
- PASS [expected FAIL] subtest: rendered legend with display: inline-flex; columns:1
- PASS [expected FAIL] subtest: rendered legend with display: inline-block; overflow:hidden;columns:1
- PASS [expected FAIL] subtest: rendered legend with display: inline-grid; overflow:hidden;columns:1
- PASS [expected FAIL] subtest: rendered legend with display: inline-flex; overflow:hidden;columns:1

github-actions · 2026-02-25T13:39:44Z

⚠️ Try run (#22396819828) failed!

github-actions · 2026-02-26T16:21:18Z

🔨 Triggering try run (#22450879298) for Linux (WPT)

servo-wpt-sync · 2026-02-26T16:24:02Z

🤖 Opened new upstream WPT pull request (web-platform-tests/wpt#58075) with upstreamable changes.

github-actions · 2026-02-26T16:26:47Z

🔨 Triggering try run (#22451124643) for Linux (WPT)

servo-wpt-sync · 2026-02-26T16:27:33Z

✍ Updated existing upstream WPT pull request (web-platform-tests/wpt#58075) title and body.

This fixes an oversight from servo#42783: when detecting that a box can be reused, we weren't clearing the box damage propagated to ancestors, so ancestors were still recollecting children. Co-authored-by: Luke Warlow <[email protected]> Co-authored-by: Martin Robinson <[email protected]> Signed-off-by: Oriol Brufau <[email protected]>

servo-wpt-sync · 2026-02-26T16:43:01Z

📝 Transplanted new upstreamable changes to existing upstream WPT pull request (web-platform-tests/wpt#58075).

github-actions · 2026-02-26T17:25:24Z

Test results for linux-wpt from try job (#22450879298):

Flaky unexpected result (23)

OK [expected TIMEOUT] /IndexedDB/idbfactory_open.any.worker.html
- PASS [expected FAIL] subtest: Calling open() with version argument 1.5 should not throw.
- PASS [expected TIMEOUT] subtest: Calling open() with version argument 9007199254740991 should not throw.
- PASS [expected TIMEOUT] subtest: Calling open() with version argument undefined should not throw.

OK /IndexedDB/idbtransaction-oncomplete.any.html (#42845)

FAIL [expected PASS] subtest: IDBTransaction - complete event

assert_array_equals: lengths differ, expected array ["upgradeneeded", "complete", "success", "opencursor"] length 4, got ["upgradeneeded", "complete", "success"] length 3

ERROR [expected OK] /_webgl/conformance/canvas/canvas-zero-size.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...
OK /content-security-policy/frame-ancestors/frame-ancestors-path-ignored.window.html (#36468)
- PASS [expected FAIL] subtest: A 'frame-ancestors' CSP directive with a URL that includes a path should be ignored.
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...
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/accumulated-oversized-payload.https.window.html (#41705)
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/sandboxed-iframe.https.window.html (#41704)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Cross-site
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/browsing-the-web/navigating-across-documents/refresh/same-document-refresh.html (#34597)

FAIL [expected PASS] subtest: Same-Document Referrer from Refresh

assert_equals: original page loads expected "http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/refresh/resources/refresh-with-section.sub.html?url=%23section" but got "http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/refresh/resources/refresh-with-section.sub.html?url=%23section#section"

CRASH [expected TIMEOUT] /html/browsers/history/the-history-interface/002.html (#12580)
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
```
CRASH [expected OK] /html/webappapis/timers/cleartimeout-clearinterval.any.html
OK /paint-timing/first-image-child.html (#42455)
- PASS [expected FAIL] subtest: Child iframe ignores paint-timing events fired from parent image rendering.
OK /paint-timing/with-lcp/fcp-document-opacity-image.html
- FAIL [expected PASS] subtest: Test that FCP after opacity change is not a larger value than LCP
```
assert_equals: First contentful paint marked too early.  expected 0 but got 1
```
OK /resource-timing/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (link)
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)
- PASS [expected FAIL] subtest: Navigate a frame via anchor with javascript:-urls in report-only mode.
OK /webdriver/tests/classic/take_screenshot/iframe.py
- ERROR [expected PASS] subtest: test_always_captures_top_browsing_context
```
setup error: ConnectionRefusedError: [Errno 111] Connection refused
```
- ERROR [expected PASS] subtest: test_source_origin[same_origin]
```
setup error: ConnectionRefusedError: [Errno 111] Connection refused
```
- ERROR [expected PASS] subtest: test_source_origin[cross_origin]
```
setup error: ConnectionRefusedError: [Errno 111] Connection refused
```
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)
ERROR [expected OK] /workers/baseurl/alpha/sharedworker-in-worker.html (#21315)

Stable unexpected results that are known to be intermittent (23)

OK /IndexedDB/transaction-scheduling-mixed-scopes.any.html (#42753)
- PASS [expected FAIL] subtest: Check that scope restrictions on mixed transactions are enforced.
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)
ERROR [expected CRASH] /_webgl/conformance2/misc/uninitialized-test-2.html (#41656)
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(fangsong)
OK /css/css-fonts/generic-family-keywords-003.html (#38994)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted fantasy (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted monospace (drawing text in a canvas)
- 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 math (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(fangsong) (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-monospace (drawing text in a canvas)
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy cross-site destination
TIMEOUT /fetch/metadata/generated/css-images.sub.tentative.html (#29047)
- FAIL [expected PASS] subtest: content sec-fetch-site - HTTPS downgrade-upgrade
```
assert_unreached: Reached unreachable code
```
OK [expected ERROR] /fetch/metadata/window-open.https.sub.html (#40339)

OK /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html (#28697)

FAIL [expected PASS] subtest: aElement.click() before the load event must NOT replace

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%20a%20%3D%20document.createElement(%22a%22)%3B%0A%20%20%20%20a.href%20%3D%20%22%2Fcommon%2Fblank.html%3Fthereplacement%22%3B%0A%20%20%20%20document.currentScript.before(a)%3B%0A%20%20%20%20a.click()%3B%0A%20%20"

OK /html/browsers/history/the-history-interface/traverse_the_history_3.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 3 but got 2 (expected array [6, 3] got [6, 2])
```
OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted

OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)

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;/body&gt;

FAIL [expected NOTRUN] subtest: Host element with delegatesFocus including no focusable descendants should be skipped

assert_equals: expected Element node &lt;input autofocus=""&gt;&lt;/input&gt; but got Element node &lt;body&gt;&lt;div autofocus=""&gt;&lt;/div&gt;&lt;input autofocus=""&gt;&lt;/body&gt;

FAIL [expected NOTRUN] subtest: Area element should support autofocus

promise_test: Unhandled rejection with value: object "TypeError: can't access property "appendChild", w.document.querySelector(...) is null"

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 /html/semantics/embedded-content/media-elements/autoplay-default-feature-policy.https.sub.html (#41193)
- PASS [expected TIMEOUT] subtest: Default "autoplay" feature policy ["self"] allows same-origin iframes.
TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/src_object_blob.html (#40340)
- TIMEOUT [expected PASS] subtest: HTMLMediaElement.srcObject blob
```
Test timed out
```
OK /html/semantics/scripting-1/the-script-element/execution-timing/077.html (#22139)
- PASS [expected FAIL] subtest: adding several types of scripts through the DOM and removing some of them confuses scheduler
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/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
```
OK /resource-timing/test_resource_timing.html (#25720)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (link)
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
```

Stable unexpected results (2)

OK /_mozilla/incremental-layout/basic-fragment-tree-layout.html
- FAIL [expected PASS] subtest: Updating div2's width property rebuilds some fragments
```
assert_equals: rebuiltFragmentCount expected 6 but got 7
```
- FAIL [expected PASS] subtest: Updating div3's height property rebuilds some fragments
```
assert_equals: rebuiltFragmentCount expected 6 but got 7
```
FAIL [expected PASS] /css/CSS2/lists/list-item-dynamic-color.html

github-actions · 2026-02-26T17:25:38Z

⚠️ Try run (#22450879298) failed!

github-actions · 2026-02-26T17:36:44Z

⚠️ Try run (#22451124643) failed!

Loirooriol · 2026-02-26T17:57:10Z

The tests pass locally, I guess it's just that I triggered them before rebasing

…#42847) This fixes an oversight from servo#42783: when detecting that a box can be reused, we weren't clearing the box damage propagated to ancestors, so ancestors were still recollecting children. This exposed some problems in `rebuild_box_tree_from_independent_formatting_context()`: 1. When reusing a block-level box that established an independent formatting context, we weren't checking that the new style was still block-level. 2. When reusing a block-level abspos box, we weren't checking if the new original display was inline-level, preventing it from being handled as a block-level because of the static position. 3. When reusing a flex item, we weren't checking if the `order` had changed. Testing: we have test coverage for the 3 problems above: 1. Covered by `/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-display.html`, and also adding a new `/css/css-display/display-flow-root-dynamic.html`. 2. Covered by `/css/CSS2/abspos/hypothetical-box-dynamic.html` 3. Covered by `/css/css-display/order-dynamic.html`. Signed-off-by: Oriol Brufau <[email protected]> Co-authored-by: Luke Warlow <[email protected]> Co-authored-by: Martin Robinson <[email protected]>

This change includes two related fixes for flakiness revealed by servo#42847. 1. When caching fonts, try harder to not re-cache a font. This could happen due to a race condition with the read-write lock on the font cache. This change improves memory usage in some cases as it prevents a font from being loaded twice. 2. Incorporate both the strut size and the block size contribution of a previously unused font in an inline container. Before the code was incorporating one or the other. In addition, *only* incorporate the block contribution of a previously unused font if its metrics meaningfully differ from the container's default font. This was the case triggered by failing to have the fix in part one of the change. Co-authored-by: Oriol Brufau <[email protected]> Co-authored-by: Luke Warlow <[email protected]> Signed-off-by: Martin Robinson <[email protected]>

#42960) This change includes two related fixes for flakiness revealed by #42847. 1. When caching fonts, try harder to not re-cache a font. This could happen due to a race condition with the read-write lock on the font cache. This change improves memory usage in some cases as it prevents a font from being loaded twice. 2. Incorporate both the strut size and the block size contribution of a previously unused font in an inline container. Before the code was incorporating one or the other. In addition, *only* incorporate the block contribution of a previously unused font if its metrics meaningfully differ from the container's default font. This was the case triggered by failing to have the fix in part one of the change. Testing: This fixes flakiness in an internal WPT-style test. Fixes: #42908. Signed-off-by: Martin Robinson <[email protected]> Co-authored-by: Oriol Brufau <[email protected]> Co-authored-by: Luke Warlow <[email protected]>

Loirooriol added A-layout/2020 https://github.com/servo/servo/wiki/Layout-2020 T-linux-wpt Do a try run of the WPT labels Feb 25, 2026

github-actions bot removed the T-linux-wpt Do a try run of the WPT label Feb 25, 2026

Loirooriol force-pushed the optimization branch from 3f06c81 to 7508798 Compare February 26, 2026 16:20

Loirooriol added the T-linux-wpt Do a try run of the WPT label Feb 26, 2026

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servo-wpt-sync mentioned this pull request Feb 26, 2026

layout: Remove box damage for parent when we can reuse the box web-platform-tests/wpt#58075

Merged

Loirooriol added the T-linux-wpt Do a try run of the WPT label Feb 26, 2026

Loirooriol marked this pull request as ready for review February 26, 2026 16:26

Loirooriol requested a review from mrobinson as a code owner February 26, 2026 16:26

servo-highfive added S-awaiting-review There is new code that needs to be reviewed. S-needs-rebase There are merge conflict errors. labels Feb 26, 2026

github-actions bot removed the T-linux-wpt Do a try run of the WPT label Feb 26, 2026

Loirooriol force-pushed the optimization branch from 7508798 to be22d22 Compare February 26, 2026 16:35

servo-highfive removed the S-needs-rebase There are merge conflict errors. label Feb 26, 2026

mrobinson approved these changes Feb 26, 2026

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servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Feb 26, 2026

Loirooriol added this pull request to the merge queue Feb 26, 2026

servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Feb 26, 2026

Loirooriol removed this pull request from the merge queue due to a manual request Feb 26, 2026

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Feb 26, 2026

Loirooriol added this pull request to the merge queue Feb 26, 2026

servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Feb 26, 2026

Merged via the queue into servo:main with commit 876abf9 Feb 26, 2026
33 of 34 checks passed

Loirooriol deleted the optimization branch February 26, 2026 21:41

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Feb 26, 2026

Loirooriol mentioned this pull request Feb 27, 2026

Intermittent FAIL in /_mozilla/css/img_size_a.html #42908

Closed

mrobinson mentioned this pull request Mar 2, 2026

layout/fonts: Mitigate races related to quirks mode and fallback fonts #42960

Merged

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Loirooriol commented Feb 25, 2026 •

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