script: Implement efficient TreeIterator without rooting when possible by Narfinger · Pull Request #42781 · servo/servo

Narfinger · 2026-02-23T14:16:07Z

This implements an two types:

Efficient Tree Iterator that can be used without rooting when possible.
UnrootedDom that can be used while not rooting while capturing a NoGC.

We:

introduce new methods in 'script/dom/node.rs' to get the correct iterator.
introduce methods in 'script/dom/node.rs' to get the unrooted children in an 'UnrootedDom' container.

We use the new TreeIterator in 'script/dom/document.rs' Open.

Testing: WPT tests should catch this but careful review is required.

Narfinger · 2026-02-23T14:18:09Z

This is related to this discussion #general > Can we lazily unroot DomRoot<_>? and pinging @sagudev and @webbeef to have a look at this idea.

sagudev · 2026-02-23T16:44:56Z

How to fix crown so that it accepts it?

I think #[cfg_attr(crown, crown::unrooted_must_root_lint::allow_unrooted_interior)] should do the job, and we should also write the docs why is it OK (because of cx).

Can we make sure that nobody calls the unsafe methods? I feel like unsafe keyword would be exactly for that but script seems to deny it currently.

Unsafe is globally forbiden, but you can allow it locally using #[expect(unsafe_code)]. And yes using proper unsafe is a must.

components/script/dom/node.rs

Narfinger · 2026-02-24T15:01:07Z

Ok I guess we can live currently with just capturing &JSContext using the NoGC. Is there a way to construct a NoGC or only from JSContext?

jdm · 2026-02-24T15:21:22Z

Ok I guess we can live currently with just capturing &JSContext using the NoGC. Is there a way to construct a NoGC or only from JSContext?

It's only possible from JSContext.

Narfinger · 2026-02-25T10:43:23Z

Ok I think I found a nice solution now without the Unsafe code.
Now we have an Unrooted type that has the lifetime of the NoGC, making it safe to use.
This could also lead to having more unrooted things used elsewhere safely.

Narfinger · 2026-02-25T11:09:05Z

Ok we now use it in one way the new iterator and see if wpt tests find anything.

github-actions · 2026-02-25T11:09:32Z

🔨 Triggering try run (#22394203015) for Linux (WPT)

github-actions · 2026-02-25T11:44:29Z

Test results for linux-wpt from try job (#22394203015):

Flaky unexpected result (22)

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.
TIMEOUT [expected OK] /_mozilla/input-events/input-events-textarea-cut-paste.html
CRASH [expected OK] /_webgl/conformance2/wasm/readpixels-2gb-in-4gb-wasm-memory.html
FAIL [expected PASS] /css/css-backgrounds/background-size-042.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)
TIMEOUT /fetch/metadata/generated/css-images.https.sub.tentative.html (#42229)
- FAIL [expected PASS] subtest: content sec-fetch-site - Cross-Site -> Cross-Site
```
assert_unreached: Reached unreachable code
```
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 /html/browsers/browsing-the-web/overlapping-navigations-and-traversals/cross-document-nav-cross-document-nav.html (#29181)
- PASS [expected FAIL] subtest: cross-document navigation then cross-document navigation
CRASH [expected TIMEOUT] /html/browsers/browsing-the-web/unloading-documents/prompt-and-unload-script-closeable.html
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/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"
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html (#28259)
- TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with "top" fragments should work.
```
Test timed out
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
- TIMEOUT [expected FAIL] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks
```
Test timed out
```
TIMEOUT [expected OK] /html/semantics/embedded-content/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/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
TIMEOUT [expected OK] /html/user-activation/navigation-state-reset-sameorigin.html
- TIMEOUT [expected PASS] subtest: Post-navigation state reset.
```
Test timed out
```
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/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
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 [expected TIMEOUT] /webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.html (#29053)
- PASS [expected TIMEOUT] subtest: StorageKey: test 3P about:blank window opened from a 3P iframe

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/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

FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
- TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo
```
Test timed out
```
CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #45
- PASS [expected FAIL] subtest: WebGL test #47
- PASS [expected FAIL] subtest: WebGL test #49
- PASS [expected FAIL] subtest: WebGL test #51
OK /beacon/beacon-basic.https.window.html (#41723)
- PASS [expected FAIL] subtest: Payload size restriction should be accumulated: type = string
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-cascade/layer-cssom-order-reverse.html (#36094)
- PASS [expected FAIL] subtest: Delete layer invalidates @font-face
OK /css/css-cascade/layer-font-face-override.html (#35935)
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 1
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 2
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
OK /css/css-fonts/generic-family-keywords-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(khmer-mul) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-rounded (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 same-site destination
OK [expected ERROR] /fetch/metadata/window-open.https.sub.html (#40339)
OK /html/browsers/history/the-history-interface/traverse_the_history_4.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])
```

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 /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/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 CRASH] /resource-timing/render-blocking-status-link.html (#41664)
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?26-30 (#38807)
- PASS [expected TIMEOUT] subtest: Navigate a window via form-submission with javascript:-urls in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a window via form-submission with javascript:-urls w/ default policy in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls in enforcing mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```

Stable unexpected results (2)

OK /html/webappapis/dynamic-markup-insertion/opening-the-input-stream/006.html
- FAIL [expected PASS] subtest: Cancelling error after document.open
```
assert_unreached: Reached unreachable code
```

OK /html/webappapis/dynamic-markup-insertion/opening-the-input-stream/event-listeners.window.html

FAIL [expected PASS] subtest: Standard event listeners are to be removed

assert_unreached: element event listener not removed Reached unreachable code

FAIL [expected PASS] subtest: Custom event listeners are to be removed

assert_unreached: body event listener not removed Reached unreachable code

FAIL [expected PASS] subtest: IDL attribute event handlers are to be deactivated

assert_equals: expected (object) null but got (function) function "function()
        {
            return test_this.step.apply(test_this, [func, this_obj].concat(
                Array.prototype.slice.call(arguments)));
        }"

FAIL [expected PASS] subtest: Content attribute event handlers are to be deactivated

assert_equals: expected (object) null but got (function) function "function onclick(event) {
parent.thrower()
}"

FAIL [expected PASS] subtest: Event listeners are to be removed from shadow trees as well

assert_unreached: [object ShadowRoot]'s event listener not removed Reached unreachable code

github-actions · 2026-02-25T11:44:39Z

⚠️ Try run (#22394203015) failed!

Narfinger · 2026-02-25T12:10:50Z

To me these failures look unrelated so this is ready to review.

github-actions · 2026-02-25T12:14:43Z

🔨 Triggering try run (#22396385173) for Linux (WPT)

github-actions · 2026-02-25T13:24:43Z

Test results for linux-wpt from try job (#22396385173):

Flaky unexpected result (24)

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 /_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 /_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...
FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
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-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 /css/css-fonts/variations/font-weight-matching.html (#38577)

FAIL [expected PASS] subtest: Test @font-face matching for weight 250

assert_approx_equals: @font-face should be mapped to CSSTest Weights 800. expected 90 +/- 2 but got 180

FAIL [expected PASS] subtest: Test @font-face matching for weight 399

assert_approx_equals: @font-face should be mapped to CSSTest Weights 800. expected 90 +/- 2 but got 180

FAIL [expected PASS] subtest: Test @font-face matching for weight 420

assert_approx_equals: @font-face should be mapped to CSSTest Weights 600. expected 90 +/- 2 but got 180

FAIL [expected PASS] subtest: Test @font-face matching for weight 470

assert_approx_equals: @font-face should be mapped to CSSTest Weights 300. expected 90 +/- 2 but got 180

FAIL [expected PASS] subtest: Test @font-face matching for weight 500

assert_approx_equals: @font-face should be mapped to CSSTest Weights 300. expected 90 +/- 2 but got 180

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/multiple-iframes.https.window.html (#35176)
OK /html/browsers/history/the-history-interface/traverse_the_history_2.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
- TIMEOUT [expected FAIL] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks
```
Test timed out
```
TIMEOUT [expected OK] /html/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 /mixed-content/tentative/autoupgrades/mixed-content-cors.https.sub.html (#41123)
- FAIL [expected PASS] subtest: Cross-Origin audio should get upgraded even if CORS is set
```
assert_equals: Length of other host audio is correct expected 1 but got Infinity
```
PASS [expected FAIL] /png/apng/acTL-plays-one.html (#41218)
OK /pointerevents/compat/pointerevent_touch_target_after_pointerdown_target_removed.tentative.html (#42813)
- PASS [expected FAIL] subtest: After a pointerdown listener moves the target to different position, touch events should be fired on the pointerdown target, but pointer events should be fired on the pointerdown target parent
- PASS [expected FAIL] subtest: After a pointerdown listener moves the target to different position, touchmove event should be fired on the pointerdown target parent
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/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 (link)
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] /webaudio/the-audio-api/the-mediastreamaudiodestinationnode-interface/closed-audiocontext-construction.html
OK [expected TIMEOUT] /webdriver/tests/classic/perform_actions/navigation.py
OK /webxr/xrSession_features_deviceSupport.https.html (#24357)
- FAIL [expected PASS] subtest: Immersive XRSession requests with no supported device should reject
```
assert_unreached: Should have rejected: undefined Reached unreachable code
```
CRASH [expected OK] /workers/WorkerNavigator_onLine.htm

Stable unexpected results that are known to be intermittent (20)

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
```
ERROR [expected CRASH] /_webgl/conformance2/misc/uninitialized-test-2.html (#41656)
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-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 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 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)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-serif (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-sans-serif (drawing text in a canvas)
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-dest
- PASS [expected FAIL] subtest: sec-fetch-user
OK [expected ERROR] /fetch/metadata/window-open.https.sub.html (#40339)
OK /html/browsers/history/the-history-interface/traverse_the_history_4.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])
```
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"
```
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
```
OK /html/semantics/embedded-content/media-elements/media_fragment_seek.html (#24114)
- PASS [expected FAIL] subtest: Video should seek to time specified in media fragment syntax
TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/src_object_blob.html (#40340)
- TIMEOUT [expected PASS] subtest: HTMLMediaElement.srcObject blob
```
Test timed out
```
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/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)
- FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
```
assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false
```
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!\""
```

Stable unexpected results (2)

OK /html/webappapis/dynamic-markup-insertion/opening-the-input-stream/006.html
- FAIL [expected PASS] subtest: Cancelling error after document.open
```
assert_unreached: Reached unreachable code
```

OK /html/webappapis/dynamic-markup-insertion/opening-the-input-stream/event-listeners.window.html

FAIL [expected PASS] subtest: Standard event listeners are to be removed

assert_unreached: element event listener not removed Reached unreachable code

FAIL [expected PASS] subtest: Custom event listeners are to be removed

assert_unreached: body event listener not removed Reached unreachable code

FAIL [expected PASS] subtest: IDL attribute event handlers are to be deactivated

assert_equals: expected (object) null but got (function) function "function()
        {
            return test_this.step.apply(test_this, [func, this_obj].concat(
                Array.prototype.slice.call(arguments)));
        }"

FAIL [expected PASS] subtest: Content attribute event handlers are to be deactivated

assert_equals: expected (object) null but got (function) function "function onclick(event) {
parent.thrower()
}"

FAIL [expected PASS] subtest: Event listeners are to be removed from shadow trees as well

assert_unreached: [object ShadowRoot]'s event listener not removed Reached unreachable code

github-actions · 2026-02-25T13:24:52Z

⚠️ Try run (#22396385173) failed!

mrobinson · 2026-02-25T13:26:44Z

@Narfinger It seems like these tests might be consistently failing?

Narfinger · 2026-02-25T13:27:33Z

Yes. I can investigate when I find some time.

github-actions · 2026-02-25T14:12:51Z

🔨 Triggering try run (#22400581426) for Linux (WPT)

github-actions · 2026-02-25T14:52:42Z

Test results for linux-wpt from try job (#22400581426):

Flaky unexpected result (25)

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

FAIL [expected PASS] subtest: offsetTop

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

FAIL [expected PASS] subtest: offsetLeft

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

OK /_mozilla/mozilla/getBoundingClientRect.html (#39668)
- FAIL [expected PASS] subtest: getBoundingClientRect 1
```
assert_equals: expected 62 but got 60.35
```
OK [expected TIMEOUT] /_webgl/conformance/textures/misc/tex-video-using-tex-unit-non-zero.html (#39735)
- PASS [expected NOTRUN] subtest: Overall test
- PASS [expected FAIL] subtest: WebGL test #0
CRASH [expected OK] /_webgl/conformance2/rendering/draw-buffers-driver-hang.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.
TIMEOUT [expected OK] /credential-management/credentialscontainer-frame-basics.https.html (#39430)
- TIMEOUT [expected FAIL] subtest: navigator.credentials should be undefined in documents generated from data: URLs.
```
Test timed out
```
FAIL [expected PASS] /css/css-backgrounds/border-image-repeat-space-9.html
OK /css/css-cascade/layer-font-face-override.html (#35935)
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 1
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
- FAIL [expected PASS] subtest: @font-face override update with appended sheet 2
```
assert_equals: expected "80px" but got "38.3166666666667px"
```
FAIL [expected PASS] /css/css-ui/compute-kind-widget-generated/kind-of-widget-fallback-radio-input-border-image-source-001.html
CRASH [expected OK] /html/anonymous-iframe/require-corp-embed-anonymous-iframe.tentative.https.window.html
CRASH [expected OK] /html/browsers/browsing-the-web/history-traversal/001.html
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 [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"
```
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html (#28259)
- TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with non-existent fragments should work.
```
Test timed out
```
OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
- FAIL [expected PASS] subtest: Meta refresh of the original iframe is not blocked if moved into a sandboxed iframe
```
uncaught exception: Error: assert_unreached: The iframe into which the meta was moved must not refresh Reached unreachable code
```
TIMEOUT [expected 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/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
```
PASS [expected FAIL] /png/apng/fcTL-dispose-none.html (#41817)
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?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 /visual-viewport/resize-event-order.html (#41981)
- PASS [expected FAIL] subtest: Popup: DOMWindow resize fired before VisualViewport.
OK [expected TIMEOUT] /webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.html (#29053)
- PASS [expected TIMEOUT] subtest: StorageKey: test 3P about:blank window opened from a 3P iframe
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)
CRASH [expected OK] /workers/constructors/Worker/use-base-url.html

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

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 /beacon/beacon-basic.https.window.html (#41723)
- FAIL [expected PASS] subtest: Payload size restriction should be accumulated: type = blob
```
assert_false: expected false got true
```
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(khmer-mul)
```
assert_equals: quoted generic(khmer-mul) 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 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 [expected ERROR] /fetch/metadata/window-open.https.sub.html (#40339)
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])
```
OK /html/browsers/history/the-history-interface/traverse_the_history_4.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])
```
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 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 FAIL] subtest: Element with tabindex should support autofocus
```
Test timed out
```
- NOTRUN [expected PASS] subtest: Non-HTMLElement should not support autofocus
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
- TIMEOUT [expected FAIL] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks
```
Test timed out
```
OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-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/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 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 (img)
OK /resource-timing/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?26-30 (#38807)
- PASS [expected TIMEOUT] subtest: Navigate a window via form-submission with javascript:-urls in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a window via form-submission with javascript:-urls w/ default policy in report-only mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls in enforcing mode.
- PASS [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected NOTRUN] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
```
Test timed out
```

github-actions · 2026-02-25T14:55:59Z

✨ Try run (#22400581426) succeeded.

components/script/dom/node.rs

sagudev · 2026-03-02T17:08:57Z

Great stuff and it really highlights the importance of &mut JSContext. I am a bit worried because one of invariant of servo is that if you have &DomObject it is rooted somewhere (implicit root). While this work brakes this invariant it's OK ,because for the life of the ref we also have NoGC. But it is something we (me) need to consider when doing phase 2 &mut JSContext.

Signed-off-by: Narfinger <[email protected]>

In the same vein as #42781 we implement a UnrootedSimpleNodeIterator that takes a no_gc and does not root the required nodes. We include an example usage in 'dom/text.rs' WholeText. This requires #42781 to be merged first. --------- Signed-off-by: Narfinger <[email protected]>

Narfinger requested a review from gterzian as a code owner February 23, 2026 14:16

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Feb 23, 2026

sagudev reviewed Feb 23, 2026

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Narfinger force-pushed the treeiterator-testing branch from dfecae9 to c42c633 Compare February 25, 2026 10:44

Narfinger added the T-linux-wpt Do a try run of the WPT label Feb 25, 2026

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

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jschwe reviewed Feb 25, 2026

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sagudev self-requested a review February 25, 2026 18:21

sagudev approved these changes Mar 2, 2026

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servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Mar 2, 2026

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Mar 2, 2026

sagudev mentioned this pull request Mar 2, 2026

Safety from ground up #40600

Open

1 task

Narfinger mentioned this pull request Mar 3, 2026

script: Add UnrootedSimpleNodeIterator #42978

Merged

Narfinger force-pushed the treeiterator-testing branch from a857845 to 38deda1 Compare March 6, 2026 03:21

Narfinger added 10 commits March 6, 2026 04:22

initial design

f6d684f

Signed-off-by: Narfinger <[email protected]>

small changes

f590202

Signed-off-by: Narfinger <[email protected]>

remove unused smart function

78153a0

Signed-off-by: Narfinger <[email protected]>

more formatting

53561c7

Signed-off-by: Narfinger <[email protected]>

more formatting

3c7c6fa

Signed-off-by: Narfinger <[email protected]>

remove unsafe

0133877

Signed-off-by: Narfinger <[email protected]>

add single use for it

487bb55

Signed-off-by: Narfinger <[email protected]>

fix iterator

8e0888e

Signed-off-by: Narfinger <[email protected]>

remove safety comments

425343e

Signed-off-by: Narfinger <[email protected]>

incorporate suggestions

38deda1

Signed-off-by: Narfinger <[email protected]>

sagudev added this pull request to the merge queue Mar 6, 2026

servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Mar 6, 2026

yezhizhen removed this pull request from the merge queue due to a manual request Mar 6, 2026

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Mar 6, 2026

yezhizhen changed the title ~~Script: Efficient TreeIterator without rooting when possible~~ script: Implement efficient TreeIterator without rooting when possible Mar 6, 2026

yezhizhen added this pull request to the merge queue Mar 6, 2026

servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Mar 6, 2026

Merged via the queue into servo:main with commit 11d47b6 Mar 6, 2026
34 checks passed

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Mar 6, 2026

Narfinger deleted the treeiterator-testing branch March 6, 2026 09:16

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