layout: Reuse boxes for independent formatting contexts with self damage if compatible by Loirooriol · Pull Request #42783 · servo/servo

Loirooriol · 2026-02-23T15:27:54Z

Previously, when a formatting context root had rebuild damage from its own (not from ancestors), we weren't reusing it. Now we check if the level of the box (i.e. whether it's inline-level, block-level, a table cell, a table caption, or absolutely positioned) that will be generated by the new style is compatible with the old box. And if so, we reuse it.

Testing: Not needed, there should be no behavior change

github-actions · 2026-02-23T15:28:13Z

🔨 Triggering try run (#22312735945) for Linux (WPT)

github-actions · 2026-02-23T16:40:18Z

Test results for linux-wpt from try job (#22312735945):

Flaky unexpected result (28)

OK /FileAPI/url/url-with-fetch.any.worker.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.

OK /IndexedDB/idbtransaction-oncomplete.any.html

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

CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
CRASH [expected OK] /_webgl/conformance/glsl/bugs/sampler-struct-function-arg.html
CRASH [expected ERROR] /_webgl/conformance2/textures/misc/tex-input-validation.html (#38890)
FAIL [expected PASS] /css/css-backgrounds/background-size-042.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 "41.45px"
```
OK /css/css-fonts/generic-family-keywords-001.html (#37467)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(fangsong)
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 OK] /focus/focus-event-after-switching-iframes.sub.html (#40368)
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-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_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])
```
CRASH [expected OK] /html/browsers/sandboxing/sandbox-initial-empty-document-toward-same-origin.html (#35948)
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/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"

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.
OK /html/semantics/scripting-1/the-script-element/module/dynamic-import/blob-url.any.worker.html (#33909)
- FAIL [expected PASS] subtest: Revoking a blob URL immediately after calling import will not fail
```
promise_test: Unhandled rejection with value: object "TypeError: Module fetching failed"
```
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-tla-import.html (#42419)
- FAIL [expected PASS] subtest: document.write in an imported module
```
assert_true: onload must be called expected true got false
```
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
```
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 /resource-timing/test_resource_timing.https.html (#25216)
- 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 (xmlhttprequest)
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.
OK [expected 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.
- 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 OK] /workers/Worker-timeout-decreasing-order.html

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

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-fonts/generic-family-keywords-003.html (#38994)
- 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)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-dest
OK [expected ERROR] /fetch/metadata/window-open.https.sub.html (#40339)
CRASH [expected TIMEOUT] /html/browsers/history/the-location-interface/location_replace_session_history.html (#41896)
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 "innerHTML", w.document.body is null"
```
TIMEOUT /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- TIMEOUT [expected NOTRUN] subtest: Host element with delegatesFocus should support autofocus
```
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-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 /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/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 /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)
- 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 /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?31-35 (#38034)
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
- FAIL [expected NOTRUN] subtest: Navigate a window via form-submission 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 form-submission 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!\""
```
- FAIL [expected NOTRUN] subtest: Navigate a window via form-submission with javascript:-urls w/ a default policy making the URL invalid in enforcing mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

Stable unexpected results (6)

OK /css/css-align/blocks/align-content-block-008.html

FAIL [expected PASS] subtest: .test 17: normal

assert_equals: 
&lt;div class="test" style="align-content: normal" title="normal"&gt;
    &lt;div class="float" data-offset-y="10"&gt;FLT&lt;/div&gt;
    &lt;div class="in-flow" data-offset-y="10"&gt;&lt;/div&gt;
    &lt;div class="in-flow"&gt;
      &lt;div class="float" data-offset-y="10"&gt;FLT&lt;/div&gt;
      &lt;span class="label"&gt;NORMAL&lt;/span&gt;
      &lt;span class="abspos"&gt;ABS&lt;/span&gt;
      &lt;span class="relpos"&gt;REL&lt;/span&gt;
      &lt;div class="overflow"&gt;OVERFLOW&lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
offsetTop expected 10 but got 5

OK /css/css-align/blocks/align-content-block-009.html

FAIL [expected PASS] subtest: .test 17: normal

assert_equals: 
&lt;div class="test" style="align-content: normal" title="normal"&gt;
    &lt;div class="float" data-offset-y="40"&gt;FLT&lt;/div&gt;
    &lt;div class="in-flow" data-offset-y="40"&gt;&lt;/div&gt;
    &lt;div class="in-flow"&gt;
      &lt;div class="float" data-offset-y="40"&gt;FLT&lt;/div&gt;
      &lt;span class="label"&gt;NORMAL&lt;/span&gt;
      &lt;span class="abspos"&gt;ABS&lt;/span&gt;
      &lt;span class="relpos"&gt;REL&lt;/span&gt;
      &lt;div class="overflow"&gt;OVERFLOW&lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;
offsetTop expected 40 but got 35

CRASH [expected PASS] /css/css-display/display-contents-dynamic-flex-001-inline.html
CRASH [expected FAIL] /css/css-display/display-contents-dynamic-flex-002-inline.html
CRASH [expected FAIL] /css/css-display/display-contents-dynamic-flex-003-inline.html
CRASH [expected OK] /css/css-display/parsing/display-computed.html

github-actions · 2026-02-23T16:40:36Z

⚠️ Try run (#22312735945) failed!

github-actions · 2026-02-24T11:23:17Z

🔨 Triggering try run (#22348682455) for Linux (WPT)

github-actions · 2026-02-24T11:53:27Z

Test results for linux-wpt from try job (#22348682455):

Flaky unexpected result (20)

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.
CRASH [expected OK] /_mozilla/mozilla/img_load_more_than_cache.html
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
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
```
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/sandboxed-iframe.https.window.html (#41704)
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
OK /html/browsers/history/the-history-interface/traverse_the_history_2.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
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
CRASH [expected OK] /html/canvas/element/color-type/2d.color.type.u8p3.to.u8srgb.to.u8p3.html
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
```
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/syntax/speculative-parsing/generated/page-load/img-src-crossorigin.tentative.html
- FAIL [expected PASS] subtest: Speculative parsing, page load: img-src-crossorigin
```
Unhandled rejection: assert_not_equals: speculative case did not fetch got disallowed value ""
```
CRASH [expected OK] /imagebitmap-renderingcontext/toBlob-origin-clean-offscreen.sub.html
FAIL [expected PASS] /png/apng/fcTL-dispose-before-region-background.html
OK [expected CRASH] /resource-timing/render-blocking-status-link.html (#41664)
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] /webxr/render_state_update.https.html (#27535)

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

OK /IndexedDB/transaction-scheduling-mixed-scopes.any.html (#42753)
- PASS [expected FAIL] subtest: Check that scope restrictions on mixed transactions are enforced.
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 /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #85
- PASS [expected FAIL] subtest: WebGL test #87
- PASS [expected FAIL] subtest: WebGL test #89
- PASS [expected FAIL] subtest: WebGL test #91
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)
- 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(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)
- 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 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-serif (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.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-mode
- PASS [expected FAIL] subtest: sec-fetch-dest
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Cross-site
TIMEOUT /fetch/metadata/generated/css-images.sub.tentative.html (#29047)
- TIMEOUT [expected PASS] subtest: background-image sec-fetch-site - Not sent to non-trustworthy same-origin destination
```
Test timed out
```
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 [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
```
assert_equals: expected "DIV" but got "BODY"
```

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"

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
```
OK /navigation-timing/test-navigation-type-reload.html (#33334)
- PASS [expected FAIL] subtest: Reload domContentLoadedEventStart > Original domContentLoadedEventStart
- PASS [expected FAIL] subtest: Reload domInteractive > Original domInteractive
- PASS [expected FAIL] subtest: Reload fetchStart > Original fetchStart
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 /resource-timing/test_resource_timing.html (#25720)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (iframe)
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
```

OK /webaudio/the-audio-api/the-audiobuffersourcenode-interface/sub-sample-buffer-stitching.html (#22849)

FAIL [expected PASS] subtest: buffer-stitching-2

assert_approx_equals: Stitched sine‑wave buffers at sample rate 43800 sample[26158] |-180098355362267140 - -0.08254216611385345| = 180098355362267140 &gt; 0.0038986 expected -0.08254216611385345 +/- 0.0038986 but got -180098355362267140

github-actions · 2026-02-24T11:53:37Z

✨ Try run (#22348682455) succeeded.

Previously, when a formatting context root had rebuild damage from its own (not from ancestors), we weren't reusing it. Now we check if the level of the box (i.e. whether it's inline-level, block-level, a table cell, a table caption, or absolutely positioned) that will be generated by the new style is compatible with the old box. And if so, we reuse it. Co-authored-by: Luke Warlow <[email protected]> Co-authored-by: Martin Robinson <[email protected]> Signed-off-by: Oriol Brufau <[email protected]>

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]>

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()`: 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]>

…#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]>

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 23, 2026

github-actions bot removed the T-linux-wpt Do a try run of the WPT label Feb 23, 2026

Loirooriol force-pushed the reuse-compatible-boxes branch from b09d0bf to 9ccfc48 Compare February 23, 2026 15:28

Loirooriol force-pushed the reuse-compatible-boxes branch from 9ccfc48 to 5a64fb2 Compare February 24, 2026 11:22

Loirooriol added the T-linux-wpt Do a try run of the WPT label Feb 24, 2026

github-actions bot removed the T-linux-wpt Do a try run of the WPT label Feb 24, 2026

Loirooriol force-pushed the reuse-compatible-boxes branch from 5a64fb2 to fe10a3d Compare February 24, 2026 13:04

Loirooriol marked this pull request as ready for review February 24, 2026 13:06

Loirooriol requested a review from mrobinson as a code owner February 24, 2026 13:06

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Feb 24, 2026

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servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Feb 24, 2026

mrobinson changed the title ~~layout: Reuse formatting contexts with self damage if compatible~~ layout: Reuse boxes for independent formatting contexts with self damage if compatible Feb 24, 2026

Loirooriol added this pull request to the merge queue Feb 24, 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 24, 2026

github-merge-queue bot removed this pull request from the merge queue due to failed status checks Feb 24, 2026

servo-highfive added S-tests-failed The changes caused existing tests to fail. and removed S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. labels Feb 24, 2026

Loirooriol added this pull request to the merge queue Feb 24, 2026

servo-highfive added S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. and removed S-tests-failed The changes caused existing tests to fail. labels Feb 24, 2026

Merged via the queue into servo:main with commit a2041d6 Feb 24, 2026
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Loirooriol deleted the reuse-compatible-boxes branch February 24, 2026 19:16

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Feb 24, 2026

Loirooriol mentioned this pull request Feb 25, 2026

layout: Remove box damage for parent when we can reuse the box #42847

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layout: Reuse boxes for independent formatting contexts with self damage if compatible#42783

layout: Reuse boxes for independent formatting contexts with self damage if compatible#42783
Loirooriol merged 1 commit intoservo:mainfrom
Loirooriol:reuse-compatible-boxes

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