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Implement pending preload responses with futures#40059

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TimvdLippe merged 12 commits intoservo:mainfrom
TimvdLippe:pending-preload-response-candidate
Jan 4, 2026
Merged

Implement pending preload responses with futures#40059
TimvdLippe merged 12 commits intoservo:mainfrom
TimvdLippe:pending-preload-response-candidate

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@TimvdLippe TimvdLippe commented Oct 21, 2025 •
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This implements waiting for pending preloads, where the preload request
is still fetching the result when the second "real" request is started. It is
implemented by storing responses in the SharedPreloadedResources
which is communicated via PreloadId send to the CoreResourceManager.

Part of #35035

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TimvdLippe commented Oct 21, 2025
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@jdm I tried to follow your advice in #39794 (comment) I thought I had the gist of it, but then I ran into macro problems with cloning and serialization. Since this is the first time for me working with futures, I would like some guidance on how to proceed and where I should put what. Thanks in advance!

@jdm jdm mentioned this pull request Nov 6, 2025
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@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch from 2e35df9 to e926a72 Compare December 30, 2025 13:42
@TimvdLippe TimvdLippe added the T-linux-wpt Do a try run of the WPT label Dec 30, 2025
@github-actions github-actions bot removed the T-linux-wpt Do a try run of the WPT label Dec 30, 2025
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github-actions bot commented Dec 30, 2025

🔨 Triggering try run (#20597890883) for Linux (WPT)

@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch 2 times, most recently from d9ecbcd to edadbf7 Compare December 30, 2025 14:00
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⚠️ JUnit XML file not found

The CLI was unable to find any JUnit XML files to upload.
For more help, visit our troubleshooting guide.

@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch from edadbf7 to 315d780 Compare December 30, 2025 14:05
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github-actions bot commented Dec 30, 2025

Test results for linux-wpt from try job (#20597890883):

Flaky unexpected result (35)
  • 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/webxr/create_session.https.html
    • FAIL [expected PASS] subtest: create_session

      can't access property "simulateDeviceConnection", navigator.xr.test is undefined

  • OK /_mozilla/webxr/obtain_frame.https.html
    • FAIL [expected PASS] subtest: obtain_frame

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

  • CRASH [expected ERROR] /_webgl/conformance2/textures/misc/tex-input-validation.html (#38890)
  • OK /content-security-policy/frame-ancestors/frame-ancestors-path-ignored.window.html (#36468)
    • FAIL [expected PASS] subtest: A 'frame-ancestors' CSP directive with a URL that includes a path should be ignored.

      assert_unreached: The IFrame should have been blocked (or cross-origin). It wasn't. Reached unreachable code

  • TIMEOUT /content-security-policy/inheritance/location-reload.html (#38983)
    • FAIL [expected PASS] subtest: location.reload() of empty iframe.

      assert_equals: Image should be blocked by CSP after reload. expected "img blocked" but got "img loaded"

  • FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
  • OK /css/css-cascade/layer-font-face-override.html (#35935)
    • PASS [expected FAIL] subtest: @font-face override update with appended sheet 1
    • PASS [expected FAIL] subtest: @font-face override update with appended sheet 2
  • OK /css/css-fonts/generic-family-keywords-003.html (#38994)
    • FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted serif (drawing text in a canvas)

      assert_equals: quoted serif matches  @font-face rule expected 125 but got 40

  • OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
    • PASS [expected FAIL] subtest: Null value should submit nothing
    • PASS [expected FAIL] subtest: setFormValue with an empty FormData should submit nothing
    • PASS [expected FAIL] subtest: Newline normalization - \n in value (formdata)
  • OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html (#28691)
    • PASS [expected FAIL] subtest: load event does not fire on window.open('about:blank')
  • OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
    • FAIL [expected PASS] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation

      assert_equals: expected "" but got "#fragment"

  • CRASH [expected OK] /html/browsers/sandboxing/sandbox-initial-empty-document-toward-same-origin.html (#35948)
  • TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-empty.html (#28259)
    • TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with empty fragments should work.

      Test timed out

  • OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
    • PASS [expected TIMEOUT] subtest: Non-HTMLElement should not support autofocus
    • FAIL [expected NOTRUN] subtest: Host element with delegatesFocus should support autofocus

      assert_equals: expected Element node <div autofocus=""></div> but got Element node <body><div autofocus=""></div></body>

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

      assert_equals: expected Element node <input autofocus=""></input> but got Element node <body><div autofocus=""></div><input autofocus=""></body>

    • 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 /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-1.html (#39694)
    • PASS [expected FAIL] subtest: Meta refresh is blocked by the allow-scripts sandbox flag at its creation time, not when refresh comes due
  • OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
    • FAIL [expected PASS] subtest: Meta refresh of the original iframe is not blocked if moved into a sandboxed iframe

      uncaught exception: Error: assert_unreached: The iframe into which the meta was moved must not refresh Reached unreachable code

  • TIMEOUT [expected OK] /html/semantics/embedded-content/media-elements/audio_loop_base.html (#41122)
    • NOTRUN [expected PASS] subtest: Check if audio.loop is set to true that expecting the seeking event is fired more than once
  • 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/forms/form-submission-0/multipart-formdata.window.html (#28725)
    • FAIL [expected PASS] subtest: multipart/form-data: Basic test (formdata event)

      assert_equals: expected "\r\nContent-Disposition: form-data; name=\"basic\"\r\n\r\ntest\r\n--\r\n" but got ""

    • PASS [expected FAIL] subtest: multipart/form-data: double quote in value (formdata event)
  • OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
    • FAIL [expected PASS] subtest: text/plain: Basic File test (normal form)

      assert_equals: expected "basic=file-test.txt\r\n" but got ""

    • PASS [expected FAIL] subtest: text/plain: Basic File test (formdata event)
    • PASS [expected FAIL] subtest: text/plain: 0x00 in value (normal form)
  • OK /html/semantics/forms/form-submission-0/urlencoded2.window.html (#28687)
    • FAIL [expected PASS] subtest: application/x-www-form-urlencoded: Basic File test (normal form)

      assert_equals: expected "basic=file-test.txt" but got ""

    • PASS [expected FAIL] subtest: application/x-www-form-urlencoded: Basic File test (formdata event)
    • PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in value (formdata event)
  • ERROR [expected TIMEOUT] /html/semantics/forms/form-submission-target/rel-base-target.html (#40379)
  • CRASH [expected ERROR] /html/webappapis/the-shadowrealmglobalscope-interface/self.any.shadowrealm-in-window.html
  • FAIL [expected PASS] /png/apng/acTL-plays-one.html (#41218)
  • 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 /service-workers/service-worker/fetch-event.https.html (#36234)
    • PASS [expected FAIL] subtest: Service Worker falls back to network in fetch event with POST form
  • CRASH [expected OK] /trusted-types/Element-setAttribute-setAttributeNS-sinks.tentative.html
  • CRASH [expected ERROR] /trusted-types/SharedWorker-importScripts.html
  • CRASH [expected OK] /trusted-types/eval-csp-no-tt.html
  • 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.
  • TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
    • TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.

      Test timed out

    • NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
  • OK /wasm/webapi/abort.any.worker.html (#40013)
    • FAIL [expected PASS] subtest: instantiateStreaming() asynchronously racing with abort should succeed or reject with AbortError

      assert_equals: expected "AbortError" but got "CompileError"

  • OK [expected ERROR] /webxr/render_state_update.https.html (#27535)
Stable unexpected results that are known to be intermittent (35)
  • 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/idbcursor-continuePrimaryKey-exceptions.any.html (#39277)
    • FAIL [expected PASS] subtest: IDBCursor continuePrimaryKey() on object store cursor

      assert_throws_dom: continuePrimaryKey() should throw if source is not an index function "function() {
        cursor.continuePrimaryKey(2, 2);
      }" threw object "TypeError: cursor.continuePrimaryKey is not a function" that is not a DOMException InvalidAccessError: property "code" is equal to undefined, expected 15

  • OK /IndexedDB/idbcursor-continuePrimaryKey-exceptions.any.worker.html (#39277)
    • FAIL [expected PASS] subtest: IDBCursor continuePrimaryKey() on object store cursor

      assert_throws_dom: continuePrimaryKey() should throw if source is not an index function "function() {
        cursor.continuePrimaryKey(2, 2);
      }" threw object "TypeError: cursor.continuePrimaryKey is not a function" that is not a DOMException InvalidAccessError: property "code" is equal to undefined, expected 15

  • OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
    • PASS [expected FAIL] subtest: Get all values with transaction.commit()
  • OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
    • PASS [expected FAIL] subtest: Get all values with transaction.commit()
  • OK /IndexedDB/idbrequest-onupgradeneeded.any.html (#38895)
    • PASS [expected FAIL] subtest: transaction oncomplete ordering relative to open request onsuccess
  • OK /IndexedDB/idbrequest-onupgradeneeded.any.worker.html (#38971)
    • PASS [expected FAIL] subtest: transaction oncomplete ordering relative to open request onsuccess
  • OK /IndexedDB/key-conversion-exceptions.any.html (#39305)
    • FAIL [expected PASS] subtest: IDBCursor continue() method with throwing/invalid keys

      assert_throws_exactly: key conversion with throwing getter should rethrow function "() => {
      receiver[method](key);
    }" threw object "TypeError: receiver[method] is not a function" but we expected it to throw object "getter: throwing from getter"

    • FAIL [expected PASS] subtest: IDBCursor update() method with throwing/invalid keys

      assert_throws_exactly: throwing getter should rethrow during clone function "() => {
      cursor.update(value);
    }" threw object "TypeError: cursor.update is not a function" but we expected it to throw object "getter: throwing from getter"

  • OK /IndexedDB/key-conversion-exceptions.any.worker.html (#39284)
    • FAIL [expected PASS] subtest: IDBCursor continue() method with throwing/invalid keys

      assert_throws_exactly: key conversion with throwing getter should rethrow function "() => {
      receiver[method](key);
    }" threw object "TypeError: receiver[method] is not a function" but we expected it to throw object "getter: throwing from getter"

    • FAIL [expected PASS] subtest: IDBCursor update() method with throwing/invalid keys

      assert_throws_exactly: throwing getter should rethrow during clone function "() => {
      cursor.update(value);
    }" threw object "TypeError: cursor.update is not a function" but we expected it to throw object "getter: throwing from getter"

  • OK /IndexedDB/transaction-deactivation-timing.any.worker.html (#38808)
    • PASS [expected FAIL] subtest: New transactions are deactivated before next task
    • PASS [expected FAIL] subtest: New transactions from microtask are deactivated before next task
  • FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
  • TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
    • TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo

      Test timed out

  • CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
  • OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
    • PASS [expected FAIL] subtest: WebGL test #45
    • PASS [expected FAIL] subtest: WebGL test #47
    • PASS [expected FAIL] subtest: WebGL test #49
    • PASS [expected FAIL] subtest: WebGL test #51
    • FAIL [expected PASS] subtest: WebGL test #53

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

    • FAIL [expected PASS] subtest: WebGL test #55

      assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false

    • FAIL [expected PASS] subtest: WebGL test #57

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

    • FAIL [expected PASS] subtest: WebGL test #59

      assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false

    • PASS [expected FAIL] subtest: WebGL test #61
    • PASS [expected FAIL] subtest: WebGL test #63
    • And 6 more unexpected results...
  • OK /css/css-fonts/generic-family-keywords-001.html (#37467)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(khmer-mul)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq)
  • 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] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
  • 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
  • ERROR [expected OK] /focus/focus-event-after-switching-iframes.sub.html (#40368)
  • OK /html/browsers/browsing-the-web/navigating-across-documents/005.html (#27062)
    • PASS [expected FAIL] subtest: Link with onclick navigation and href navigation
  • 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)&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_4.html (#21383)
    • PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
  • OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
    • PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
  • 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]
}"

  • TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html (#29087)
    • TIMEOUT [expected FAIL] subtest: <dialog>-contained autofocus element gets focused when the dialog is shown

      Test timed out

  • TIMEOUT /html/semantics/embedded-content/media-elements/autoplay-allowed-by-feature-policy.https.sub.html (#41404)
    • PASS [expected TIMEOUT] subtest: Feature-Policy header: autoplay * allows same-origin iframes.
  • OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-location-assign.html (#32863)
    • PASS [expected FAIL] subtest: Navigating iframe loading='lazy' before it is loaded: location.assign
  • OK /html/semantics/scripting-1/the-script-element/module/dynamic-import/blob-url.any.html (#33948)
    • PASS [expected FAIL] subtest: Revoking a blob URL immediately after calling import will not fail
  • OK /preload/prefetch-document.html (#37210)
    • PASS [expected FAIL] subtest: different-site document prefetch with 'as=document' should not be consumed
  • OK /preload/preload-error.sub.html (#37177)
    • PASS [expected FAIL] subtest: success (fetch): main
    • PASS [expected FAIL] subtest: 404 (fetch): main
  • OK /preload/preload-invalid-resources.html (#39091)
    • PASS [expected FAIL] subtest: Preloading an invalid image (invalid data) should preload and not re-fetch
    • FAIL [expected PASS] subtest: Preloading an invalid image (missing) should preload and not re-fetch

      assert_equals: /nothing.png expected 1 but got 2

  • OK [expected CRASH] /preload/preload-resource-match.https.html (#38088)
    • PASS [expected FAIL] subtest: Loading image (same-origin) with link (same-origin) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading image (no-cors) with link (no-cors) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading image (anonymous) with link (anonymous) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading image (use-credentials) with link (use-credentials) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading backgroundImage (no-cors) with link (no-cors) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading backgroundImage (same-origin) with link (same-origin) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (same-origin) with link (same-origin) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (no-cors) with link (no-cors) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (anonymous) with link (anonymous) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (use-credentials) with link (use-credentials) should reuse the preloaded response
  • OK /preload/preload-xhr.html (#39092)
    • FAIL [expected PASS] subtest: Make an XHR request immediately after creating link rel=preload.

      assert_equals: resources/dummy.xml?token=837a5c8d-cf72-4e8d-bf2d-daa6ee6f4a9c expected 1 but got 0

  • OK /webdriver/tests/classic/dismiss_alert/dismiss.py (#39098)
    • FAIL [expected PASS] subtest: test_dismiss_in_popup_window

      AssertionError: no such alert (404): No user prompt is currently active.

Stable unexpected results (6)
  • TIMEOUT [expected CRASH] /preload/link-header-modulepreload.html
  • OK [expected TIMEOUT] /preload/link-header-preload.html
    • FAIL [expected PASS] subtest: Makes sure that Link headers preload resources

      uncaught exception: Error: assert_equals: resources/dummy.js?link-header-preload2 expected 1 but got 2

  • TIMEOUT [expected CRASH] /preload/modulepreload-as.html
  • TIMEOUT [expected CRASH] /preload/modulepreload.html
  • TIMEOUT [expected CRASH] /preload/preconnect.html
  • CRASH [expected OK] /resource-timing/render-blocking-status-link.html

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github-actions bot commented Dec 30, 2025

⚠️ Try run (#20597890883) failed.

@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch from 315d780 to ee234c1 Compare December 30, 2025 14:16
@TimvdLippe TimvdLippe added the T-linux-wpt Do a try run of the WPT label Dec 30, 2025
@github-actions github-actions bot removed the T-linux-wpt Do a try run of the WPT label Dec 30, 2025
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github-actions bot commented Dec 30, 2025

🔨 Triggering try run (#20598548412) for Linux (WPT)

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github-actions bot commented Dec 30, 2025

Test results for linux-wpt from try job (#20598548412):

Flaky unexpected result (37)
  • 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 /_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/webxr/create_session.https.html
    • FAIL [expected PASS] subtest: create_session

      can't access property "simulateDeviceConnection", navigator.xr.test is undefined

  • OK /content-security-policy/frame-ancestors/frame-ancestors-path-ignored.window.html (#36468)
    • FAIL [expected PASS] subtest: A 'frame-ancestors' CSP directive with a URL that includes a path should be ignored.

      assert_unreached: The IFrame should have been blocked (or cross-origin). It wasn't. Reached unreachable code

  • 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

  • OK /css/css-animations/event-order.tentative.html (#39000)
    • PASS [expected FAIL] subtest: Same events on pseudo-elements follow the prescribed order
  • OK /css/css-fonts/generic-family-keywords-001.html (#37467)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(fangsong)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(nastaliq)
  • OK /css/css-fonts/generic-family-keywords-003.html (#38994)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted sans-serif (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 /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
    • PASS [expected FAIL] subtest: Null value should submit nothing
    • PASS [expected FAIL] subtest: Multiple values - name content attribute is ignored
    • PASS [expected FAIL] subtest: Newline normalization - \n in value (formdata)
  • 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/005.html (#27062)
    • PASS [expected FAIL] subtest: Link with onclick navigation and href navigation
  • OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
    • FAIL [expected PASS] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation

      assert_equals: expected "" but got "#fragment"

  • 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_4.html (#21383)
    • PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
  • 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.
  • OK [expected TIMEOUT] /html/semantics/embedded-content/media-elements/src_object_blob.html (#40340)
    • PASS [expected TIMEOUT] subtest: HTMLMediaElement.srcObject blob
  • 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/forms/form-submission-0/multipart-formdata.window.html (#28725)
    • FAIL [expected PASS] subtest: multipart/form-data: Basic test (formdata event)

      assert_equals: expected "\r\nContent-Disposition: form-data; name=\"basic\"\r\n\r\ntest\r\n--\r\n" but got ""

  • OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
    • FAIL [expected PASS] subtest: text/plain: Basic File test (normal form)

      assert_equals: expected "basic=file-test.txt\r\n" but got ""

    • PASS [expected FAIL] subtest: text/plain: Basic File test (formdata event)
    • PASS [expected FAIL] subtest: text/plain: backslash in filename (normal form)
  • OK /html/semantics/forms/form-submission-0/urlencoded2.window.html (#28687)
    • PASS [expected FAIL] subtest: application/x-www-form-urlencoded: Basic File test (formdata event)
    • PASS [expected FAIL] subtest: application/x-www-form-urlencoded: \r\n in name (normal form)
  • 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: Dynamic import failed"

  • OK [expected ERROR] /html/user-activation/no-activation-thru-escape-key.html (#40343)
  • CRASH [expected OK] /html/webappapis/system-state-and-capabilities/the-navigator-object/secure_context.html
  • OK /navigation-timing/test-navigation-type-reload.html (#33334)
    • PASS [expected FAIL] subtest: Reload domComplete > Original domComplete
    • PASS [expected FAIL] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
    • PASS [expected FAIL] subtest: Reload domContentLoadedEventStart > Original domContentLoadedEventStart
    • PASS [expected FAIL] subtest: Reload fetchStart > Original fetchStart
    • PASS [expected FAIL] subtest: Reload loadEventEnd > Original loadEventEnd
    • PASS [expected FAIL] subtest: Reload loadEventStart > Original loadEventStart
  • OK /preload/preload-xhr.html (#39092)
    • FAIL [expected PASS] subtest: Make an XHR request immediately after creating link rel=preload.

      assert_equals: resources/dummy.xml?token=bebfec5c-aaf4-44a0-a132-08ce02937dad expected 1 but got 0

  • CRASH [expected TIMEOUT] /referrer-policy/gen/top.meta/origin-when-cross-origin/svg-a-tag.http.html
  • CRASH [expected OK] /trusted-types/block-string-assignment-to-DedicatedWorker-setTimeout-setInterval.html
  • 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

    • NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
  • CRASH [expected TIMEOUT] /wasm/webapi/empty-body.any.worker.html
  • OK /webdriver/tests/classic/dismiss_alert/dismiss.py (#39098)
    • FAIL [expected PASS] subtest: test_dismiss_in_popup_window

      AssertionError: no such alert (404): No user prompt is currently active.

  • OK /webdriver/tests/classic/execute_script/window.py
    • FAIL [expected PASS] subtest: test_web_reference[frame]

      AssertionError: no such window (404): No such window

  • OK /webdriver/tests/classic/get_element_rect/user_prompts.py
    • FAIL [expected PASS] subtest: test_accept[alert-None]

      webdriver.error.NoSuchWindowException: no such window (404): No such window

  • 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 ERROR] /workers/interfaces/WorkerGlobalScope/location/redirect-sharedworker.html
Stable unexpected results that are known to be intermittent (29)
  • OK /IndexedDB/idbcursor-continuePrimaryKey-exceptions.any.html (#39277)
    • FAIL [expected PASS] subtest: IDBCursor continuePrimaryKey() on object store cursor

      assert_throws_dom: continuePrimaryKey() should throw if source is not an index function "function() {
        cursor.continuePrimaryKey(2, 2);
      }" threw object "TypeError: cursor.continuePrimaryKey is not a function" that is not a DOMException InvalidAccessError: property "code" is equal to undefined, expected 15

  • OK /IndexedDB/idbcursor-continuePrimaryKey-exceptions.any.worker.html (#39277)
    • FAIL [expected PASS] subtest: IDBCursor continuePrimaryKey() on object store cursor

      assert_throws_dom: continuePrimaryKey() should throw if source is not an index function "function() {
        cursor.continuePrimaryKey(2, 2);
      }" threw object "TypeError: cursor.continuePrimaryKey is not a function" that is not a DOMException InvalidAccessError: property "code" is equal to undefined, expected 15

  • OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
    • PASS [expected FAIL] subtest: Get all values with transaction.commit()
  • OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
    • PASS [expected FAIL] subtest: Get all values with transaction.commit()
  • OK /IndexedDB/idbrequest-onupgradeneeded.any.html (#38895)
    • PASS [expected FAIL] subtest: transaction oncomplete ordering relative to open request onsuccess
  • OK /IndexedDB/idbrequest-onupgradeneeded.any.worker.html (#38971)
    • PASS [expected FAIL] subtest: transaction oncomplete ordering relative to open request onsuccess
  • OK /IndexedDB/key-conversion-exceptions.any.html (#39305)
    • FAIL [expected PASS] subtest: IDBCursor continue() method with throwing/invalid keys

      assert_throws_exactly: key conversion with throwing getter should rethrow function "() => {
      receiver[method](key);
    }" threw object "TypeError: receiver[method] is not a function" but we expected it to throw object "getter: throwing from getter"

    • FAIL [expected PASS] subtest: IDBCursor update() method with throwing/invalid keys

      assert_throws_exactly: throwing getter should rethrow during clone function "() => {
      cursor.update(value);
    }" threw object "TypeError: cursor.update is not a function" but we expected it to throw object "getter: throwing from getter"

  • OK /IndexedDB/key-conversion-exceptions.any.worker.html (#39284)
    • FAIL [expected PASS] subtest: IDBCursor continue() method with throwing/invalid keys

      assert_throws_exactly: key conversion with throwing getter should rethrow function "() => {
      receiver[method](key);
    }" threw object "TypeError: receiver[method] is not a function" but we expected it to throw object "getter: throwing from getter"

    • FAIL [expected PASS] subtest: IDBCursor update() method with throwing/invalid keys

      assert_throws_exactly: throwing getter should rethrow during clone function "() => {
      cursor.update(value);
    }" threw object "TypeError: cursor.update is not a function" but we expected it to throw object "getter: throwing from getter"

  • OK /IndexedDB/transaction-deactivation-timing.any.html (#38772)
    • PASS [expected FAIL] subtest: New transactions are deactivated before next task
    • PASS [expected FAIL] subtest: New transactions from microtask are deactivated before next task
  • OK /IndexedDB/transaction-deactivation-timing.any.worker.html (#38808)
    • PASS [expected FAIL] subtest: New transactions are deactivated before next task
    • PASS [expected FAIL] subtest: New transactions from microtask are deactivated before next task
  • FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
  • TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
    • TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo

      Test timed out

  • OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
    • FAIL [expected PASS] subtest: WebGL test #77

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

    • FAIL [expected PASS] subtest: WebGL test #79

      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 #81

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

    • FAIL [expected PASS] subtest: WebGL test #83

      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

  • OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
    • PASS [expected FAIL] subtest: Delete layer invalidates @font-face
  • ERROR [expected OK] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
  • OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
    • FAIL [expected PASS] subtest: sec-fetch-mode

      promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."

  • ERROR [expected OK] /fetch/metadata/window-open.https.sub.html (#40339)
  • OK /html/browsers/browsing-the-web/navigating-across-documents/initial-empty-document/load-pageshow-events-window-open.html (#28691)
    • PASS [expected FAIL] subtest: load event does not fire on window.open('about:blank')
  • OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-location-assign.html (#32863)
    • PASS [expected FAIL] subtest: Navigating iframe loading='lazy' before it is loaded: location.assign
  • TIMEOUT [expected ERROR] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html (#40347)
  • OK /html/semantics/scripting-1/the-script-element/module/dynamic-import/blob-url.any.html (#33948)
    • PASS [expected FAIL] subtest: Revoking a blob URL immediately after calling import will not fail
  • OK /html/webappapis/user-prompts/print-during-unload.html (#35944)
    • PASS [expected FAIL] subtest: print() during unload
  • OK /mixed-content/tentative/autoupgrades/mixed-content-cors.https.sub.html (#41123)
    • FAIL [expected PASS] subtest: Cross-Origin video should get upgraded even if CORS is set

      assert_equals: Length. Other host expected 1 but got Infinity

  • FAIL [expected PASS] /png/apng/acTL-plays-one.html (#41218)
  • OK /preload/preload-error.sub.html (#37177)
    • FAIL [expected PASS] subtest: success (fetch): main

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

  • OK /preload/preload-invalid-resources.html (#39091)
    • FAIL [expected PASS] subtest: Preloading an invalid image (missing) should preload and not re-fetch

      assert_equals: /nothing.png expected 1 but got 2

  • OK [expected TIMEOUT] /preload/preload-resource-match.https.html (#38088)
    • PASS [expected FAIL] subtest: Loading image (same-origin) with link (same-origin) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading image (no-cors) with link (no-cors) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading image (anonymous) with link (anonymous) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading image (use-credentials) with link (use-credentials) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading backgroundImage (no-cors) with link (no-cors) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading backgroundImage (same-origin) with link (same-origin) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (same-origin) with link (same-origin) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (no-cors) with link (no-cors) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (anonymous) with link (anonymous) should reuse the preloaded response
    • PASS [expected FAIL] subtest: Loading style (use-credentials) with link (use-credentials) should reuse the preloaded response
  • 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 ERROR] /webxr/render_state_update.https.html (#27535)
Stable unexpected results (5)
  • OK [expected TIMEOUT] /preload/link-header-on-subresource.html
  • OK [expected TIMEOUT] /preload/link-header-preload.html
    • FAIL [expected PASS] subtest: Makes sure that Link headers preload resources

      uncaught exception: Error: assert_equals: resources/dummy.js?link-header-preload2 expected 1 but got 2

  • TIMEOUT [expected CRASH] /preload/modulepreload-as.html
  • TIMEOUT [expected CRASH] /preload/modulepreload.html
  • OK [expected TIMEOUT] /preload/single-download-preload.html

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github-actions bot commented Dec 30, 2025

⚠️ Try run (#20598548412) failed.

@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch from ee234c1 to 6c1c918 Compare December 30, 2025 14:45
@TimvdLippe TimvdLippe requested a review from jdm December 30, 2025 14:45
@TimvdLippe TimvdLippe marked this pull request as ready for review December 30, 2025 14:45
@TimvdLippe TimvdLippe requested a review from gterzian as a code owner December 30, 2025 14:45
@servo-highfive servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Dec 30, 2025
@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch from 6c1c918 to 5654a90 Compare January 2, 2026 10:25
@servo-highfive servo-highfive added S-needs-rebase There are merge conflict errors. and removed S-awaiting-review There is new code that needs to be reviewed. labels Jan 4, 2026
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jdm commented Jan 4, 2026

I'm concerned that the test results here keep switching. I was curious about the new expected: TIMEOUT for preload-resource-match.https.html and tried running with --repeat-until-unexpected, and not only do I not see a timeout, but I also saw:

/preload/preload-resource-match.https.html
  UNEXPECTED-PASS Loading image (same-origin) with link (same-origin) should reuse the preloaded response
  UNEXPECTED-PASS Loading image (no-cors) with link (no-cors) should reuse the preloaded response
  UNEXPECTED-PASS Loading image (anonymous) with link (anonymous) should reuse the preloaded response
  UNEXPECTED-PASS Loading image (use-credentials) with link (use-credentials) should reuse the preloaded response
  UNEXPECTED-PASS Loading backgroundImage (no-cors) with link (no-cors) should reuse the preloaded response
  UNEXPECTED-PASS Loading backgroundImage (same-origin) with link (same-origin) should reuse the preloaded response
  UNEXPECTED-PASS Loading style (same-origin) with link (same-origin) should reuse the preloaded response
  UNEXPECTED-PASS Loading style (no-cors) with link (no-cors) should reuse the preloaded response
  UNEXPECTED-PASS Loading style (anonymous) with link (anonymous) should reuse the preloaded response
  UNEXPECTED-PASS Loading style (use-credentials) with link (use-credentials) should reuse the preloaded response

I think we should spend more time looking into the test results before trying to merge this.

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jdm commented Jan 4, 2026

I'm going to make a pull request to this branch that improves the test result situation.

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jdm commented Jan 4, 2026

TimvdLippe#2

@servo-wpt-sync servo-wpt-sync mentioned this pull request Jan 4, 2026
Merged
TimvdLippe and others added 11 commits January 4, 2026 11:46
@TimvdLippe @jdm
Implement pending preload responses with futures
aeb11b4 
Part of servo#35035

Co-authored-by: Josh Matthews <[email protected]>
Signed-off-by: Tim van der Lippe <[email protected]>
@jdm @TimvdLippe
wpt: Make fetch test use parameters that match link preload.
462cea1 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
fonts: Add request client to web font fetch.
62d7606 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
script: Add request clients to more fetches.
68d5988 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
script: Submit timing data for preload requests before triggering loa…
7b08989 
…d events.

Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
script: Use original request URL for timing data for fetch().
1c53240 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
Update WPT results.
7f2cff8 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
script: Submit XHR timing before firing load events.
e2cdb55 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
net: Do not remove preload entry until entire response is available.
f1f5e2b 
Signed-off-by: Josh Matthews <[email protected]>
@jdm @TimvdLippe
Update WPT manifest.
c00e9fe 
Signed-off-by: Josh Matthews <[email protected]>
@TimvdLippe
Fix clippy warning
f5eb3ad 
Signed-off-by: Tim van der Lippe <[email protected]>
@TimvdLippe TimvdLippe force-pushed the pending-preload-response-candidate branch from 75609fb to f5eb3ad Compare January 4, 2026 10:48
@servo-highfive servo-highfive removed the S-needs-rebase There are merge conflict errors. label Jan 4, 2026
@TimvdLippe TimvdLippe added the T-linux-wpt Do a try run of the WPT label Jan 4, 2026
@github-actions github-actions bot removed the T-linux-wpt Do a try run of the WPT label Jan 4, 2026
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github-actions bot commented Jan 4, 2026

🔨 Triggering try run (#20691771704) for Linux (WPT)

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servo-wpt-sync commented Jan 4, 2026

📝 Transplanted new upstreamable changes to existing upstream WPT pull request (web-platform-tests/wpt#56974).

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github-actions bot commented Jan 4, 2026

Test results for linux-wpt from try job (#20691771704):

Flaky unexpected result (30)
  • TIMEOUT /FileAPI/url/url-in-tags-revoke.window.html (#19978)
    • TIMEOUT [expected PASS] subtest: Fetching a blob URL immediately before revoking it works in &lt;script&gt; tags.

      Test timed out

  • OK /_mozilla/webxr/obtain_frame.https.html
    • FAIL [expected PASS] subtest: obtain_frame

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

  • ERROR [expected TIMEOUT] /_mozilla/webxr/sessionavailable.https.html
  • CRASH [expected OK] /_webgl/conformance2/wasm/readpixels-2gb-in-4gb-wasm-memory.html
  • FAIL [expected PASS] /css/css-backgrounds/background-size-041.html
  • OK /css/css-fonts/generic-family-keywords-003.html (#38994)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-rounded (drawing text in a canvas)
  • OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
    • PASS [expected FAIL] subtest: Single value - empty name exists
    • PASS [expected FAIL] subtest: Single value - Non-empty name exists
    • PASS [expected FAIL] subtest: Null value should submit nothing
  • OK /encoding-detection/lt-windows-1257-late.tentative.html
    • FAIL [expected PASS] subtest: Check detection result

      assert_equals: Expected windows-1257 expected "windows-1257" but got "UTF-8"

  • ERROR [expected OK] /focus/focus-event-after-switching-iframes.sub.html (#40368)
  • CRASH [expected OK] /html/browsers/browsing-the-web/navigating-across-documents/005.html (#27062)
  • 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 OK] /html/browsers/history/the-history-interface/pushstate-replacestate-empty-string/replacestate.html
  • OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-form-submit.html (#32607)
    • FAIL [expected PASS] subtest: Navigating iframe loading='lazy' before it is loaded: form submit

      uncaught exception: Error: assert_equals: expected "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?" 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/multipart-formdata.window.html (#28725)
    • PASS [expected FAIL] subtest: multipart/form-data: 0x00 in value (formdata event)
    • PASS [expected FAIL] subtest: multipart/form-data: \n in value (formdata event)
  • OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
    • FAIL [expected PASS] subtest: text/plain: Basic test (formdata event)

      assert_equals: expected "basic=test\r\n" but got ""

    • FAIL [expected PASS] subtest: text/plain: Basic File test (normal form)

      assert_equals: expected "basic=file-test.txt\r\n" but got ""

    • PASS [expected FAIL] subtest: text/plain: Basic File test (formdata event)
    • PASS [expected FAIL] subtest: text/plain: \r\n in name (formdata event)
  • OK /navigation-timing/test-navigation-type-reload.html (#33334)
    • PASS [expected FAIL] subtest: Reload domContentLoadedEventStart &gt; Original domContentLoadedEventStart
    • PASS [expected FAIL] subtest: Reload domInteractive &gt; Original domInteractive
    • PASS [expected FAIL] subtest: Reload fetchStart &gt; Original fetchStart
  • CRASH [expected ERROR] /trusted-types/SharedWorker-importScripts.html
  • CRASH [expected OK] /trusted-types/eval-csp-no-tt.html
  • CRASH [expected OK] /trusted-types/get-trusted-types-compliant-attribute-value.html
  • TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
    • TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.

      Test timed out

    • NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
  • CRASH [expected OK] /upgrade-insecure-requests/gen/srcdoc-inherit.meta/unset/sharedworker-classic.https.html
  • CRASH [expected TIMEOUT] /wasm/webapi/invalid-code.any.worker.html
  • OK /webdriver/tests/classic/dismiss_alert/dismiss.py (#39098)
    • FAIL [expected PASS] subtest: test_dismiss_in_popup_window

      AssertionError: no such alert (404): No user prompt is currently active.

  • OK /webdriver/tests/classic/element_click/center_point.py
    • FAIL [expected PASS] subtest: test_entirely_in_view

      webdriver.error.NoSuchWindowException: no such window (404): No such window

  • OK /webdriver/tests/classic/element_click/scroll_into_view.py
    • FAIL [expected PASS] subtest: test_scroll_into_view

      webdriver.error.NoSuchElementException: no such element (404)

  • OK /webdriver/tests/classic/fullscreen_window/from_minimized_window.py
    • ERROR [expected FAIL] subtest: test_fullscreen_from_minimized_window

      setup error: webdriver.error.NoSuchWindowException: no such window (404): No such window

  • OK /webdriver/tests/classic/maximize_window/maximize.py
    • ERROR [expected PASS] subtest: test_no_top_browsing_context

      setup error: webdriver.error.NoSuchElementException: no such element (404)

  • 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 /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

Stable unexpected results that are known to be intermittent (30)
  • OK /IndexedDB/idbcursor-continuePrimaryKey-exceptions.any.html (#39277)
    • FAIL [expected PASS] subtest: IDBCursor continuePrimaryKey() on object store cursor

      assert_throws_dom: continuePrimaryKey() should throw if source is not an index function "function() {
        cursor.continuePrimaryKey(2, 2);
      }" threw object "TypeError: cursor.continuePrimaryKey is not a function" that is not a DOMException InvalidAccessError: property "code" is equal to undefined, expected 15

  • OK /IndexedDB/idbcursor-continuePrimaryKey-exceptions.any.worker.html (#39277)
    • FAIL [expected PASS] subtest: IDBCursor continuePrimaryKey() on object store cursor

      assert_throws_dom: continuePrimaryKey() should throw if source is not an index function "function() {
        cursor.continuePrimaryKey(2, 2);
      }" threw object "TypeError: cursor.continuePrimaryKey is not a function" that is not a DOMException InvalidAccessError: property "code" is equal to undefined, expected 15

  • OK /IndexedDB/idbobjectstore_getAll.any.html (#39276)
    • PASS [expected FAIL] subtest: Get all values with transaction.commit()
  • OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
    • PASS [expected FAIL] subtest: Get all values with transaction.commit()
  • OK /IndexedDB/idbrequest-onupgradeneeded.any.html (#38895)
    • PASS [expected FAIL] subtest: transaction oncomplete ordering relative to open request onsuccess
  • OK /IndexedDB/idbrequest-onupgradeneeded.any.worker.html (#38971)
    • PASS [expected FAIL] subtest: transaction oncomplete ordering relative to open request onsuccess
  • OK /IndexedDB/key-conversion-exceptions.any.html (#39305)
    • FAIL [expected PASS] subtest: IDBCursor continue() method with throwing/invalid keys

      assert_throws_exactly: key conversion with throwing getter should rethrow function "() =&gt; {
      receiver[method](key);
    }" threw object "TypeError: receiver[method] is not a function" but we expected it to throw object "getter: throwing from getter"

    • FAIL [expected PASS] subtest: IDBCursor update() method with throwing/invalid keys

      assert_throws_exactly: throwing getter should rethrow during clone function "() =&gt; {
      cursor.update(value);
    }" threw object "TypeError: cursor.update is not a function" but we expected it to throw object "getter: throwing from getter"

  • OK /IndexedDB/key-conversion-exceptions.any.worker.html (#39284)
    • FAIL [expected PASS] subtest: IDBCursor continue() method with throwing/invalid keys

      assert_throws_exactly: key conversion with throwing getter should rethrow function "() =&gt; {
      receiver[method](key);
    }" threw object "TypeError: receiver[method] is not a function" but we expected it to throw object "getter: throwing from getter"

    • FAIL [expected PASS] subtest: IDBCursor update() method with throwing/invalid keys

      assert_throws_exactly: throwing getter should rethrow during clone function "() =&gt; {
      cursor.update(value);
    }" threw object "TypeError: cursor.update is not a function" but we expected it to throw object "getter: throwing from getter"

  • OK /IndexedDB/transaction-deactivation-timing.any.worker.html (#38808)
    • PASS [expected FAIL] subtest: New transactions are deactivated before next task
    • PASS [expected FAIL] subtest: New transactions from microtask are deactivated before next task
  • 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 #45
    • PASS [expected FAIL] subtest: WebGL test #47
    • PASS [expected FAIL] subtest: WebGL test #49
    • PASS [expected FAIL] subtest: WebGL test #51
    • FAIL [expected PASS] subtest: WebGL test #53

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

    • FAIL [expected PASS] subtest: WebGL test #55

      assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false

    • FAIL [expected PASS] subtest: WebGL test #57

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

    • FAIL [expected PASS] subtest: WebGL test #59

      assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false

    • PASS [expected FAIL] subtest: WebGL test #61
    • PASS [expected FAIL] subtest: WebGL test #63
    • And 6 more unexpected results...
  • OK /css/css-cascade/layer-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"

  • ERROR [expected OK] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
  • OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
    • PASS [expected FAIL] subtest: sec-fetch-dest
  • 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
  • OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
    • FAIL [expected PASS] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation

      assert_equals: expected "" but got "#fragment"

  • OK /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html (#28697)
    • PASS [expected FAIL] subtest: aElement.click() before the load event must NOT replace
  • OK /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;div autofocus=""&gt;&lt;/div&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;/body&gt;

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

      assert_equals: expected Element node &lt;area autofocus="" href="/common/blank.html"&gt;&lt;/area&gt; but got Element node &lt;body&gt;
&lt;img src="/media/poster.png" usemap="#map"&gt;
&lt;map n...

  • OK [expected TIMEOUT] /html/semantics/embedded-content/media-elements/src_object_blob.html (#40340)
    • PASS [expected TIMEOUT] subtest: HTMLMediaElement.srcObject blob
  • OK /html/semantics/forms/form-submission-0/jsurl-form-submit.tentative.html (#36489)
    • PASS [expected FAIL] subtest: Verifies that form submissions scheduled inside javascript: urls take precedence over the javascript: url's return value.
  • CRASH [expected OK] /html/semantics/forms/the-fieldset-element/disabled-003.html (#31730, #39631)
  • FAIL [expected PASS] /png/apng/acTL-plays-one.html (#41218)
  • OK /preload/preload-error.sub.html (#37177)
    • PASS [expected FAIL] subtest: 404 (image): main
    • FAIL [expected PASS] subtest: 404 (style): main

      assert_unreached: Should have rejected: undefined Reached unreachable code

    • FAIL [expected PASS] subtest: 404 (script): main

      assert_unreached: Should have rejected: undefined Reached unreachable code

    • PASS [expected FAIL] subtest: CORS (fetch): main
  • OK /resource-timing/buffer-full-add-then-clear.html (#40819)
    • PASS [expected FAIL] subtest: Test that if the buffer is cleared after entries were added to the secondary buffer, those entries make it into the primary one
  • TIMEOUT /resource-timing/test_resource_timing.html (#25720)
    • PASS [expected FAIL] subtest: window.performance.getEntriesByName() and window.performance.getEntriesByNameType() return same data (xmlhttprequest)
  • TIMEOUT /resource-timing/test_resource_timing.https.html (#25216)
    • PASS [expected FAIL] subtest: window.performance.getEntriesByName() and window.performance.getEntriesByNameType() return same data (xmlhttprequest)
    • PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
  • ERROR [expected OK] /webxr/render_state_update.https.html (#27535)
Stable unexpected results (7)
  • OK [expected TIMEOUT] /performance-timeline/navigation-id-resource-timing.tentative.html
    • FAIL [expected TIMEOUT] subtest: Resource Timing navigation id test

      assert_true: resource_timing Navigation Ids should be re-generated and different from the previous ones. expected true got false

  • OK /resource-timing/TAO-port-mismatch-means-crossorigin.html
    • PASS [expected FAIL] subtest: A port mismatch must fail the TAO check
  • OK /resource-timing/buffered-flag.any.worker.html
    • PASS [expected FAIL] subtest: PerformanceObserver with buffered flag sees previous resource entries.
  • TIMEOUT /resource-timing/content-encoding.https.html
    • FAIL [expected TIMEOUT] subtest: contentEncoding in resource timing 4

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "gzip" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 5

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "zstd" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 6

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "deflate" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 7

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "gzip" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 8

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "@unknown" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 9

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "@unknown" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 10

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "multiple" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 11

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "multiple" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 12

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "gzip" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: contentEncoding in resource timing 13

      assert_equals: run_same_origin_test failed, unexpected contentEncoding value. expected (string) "" but got (undefined) undefined

    • And 5 more unexpected results...
  • ERROR [expected TIMEOUT] /resource-timing/content-type-minimization.html
    • FAIL [expected TIMEOUT] subtest: mime-type-minimized 0 : application/ecmascript

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 1 : application/javascript

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 2 : application/x-ecmascript

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 3 : application/x-javascript

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 4 : text/ecmascript

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 5 : text/javascript

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 6 : text/javascript1.0

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 7 : text/javascript1.1

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 8 : text/javascript1.2

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • FAIL [expected NOTRUN] subtest: mime-type-minimized 9 : text/javascript1.3

      assert_equals: expected (string) "text/javascript" but got (undefined) undefined

    • And 34 more unexpected results...
  • OK [expected TIMEOUT] /resource-timing/decoded-body-size-compressed.https.html
    • FAIL [expected TIMEOUT] subtest: decodedBodySize for gzip-compressed XML resource

      assert_equals: decodedBodySize should match the uncompressed XML file size expected 125 but got 0

    • FAIL [expected NOTRUN] subtest: decodedBodySize for brotli-compressed text resource

      assert_equals: decodedBodySize should match the uncompressed brotli file size expected 10500 but got 0

    • FAIL [expected NOTRUN] subtest: decodedBodySize for gzip-compressed text resource

      assert_equals: decodedBodySize should match the uncompressed gzip file size expected 10500 but got 0

    • FAIL [expected NOTRUN] subtest: decodedBodySize for dynamically gzip-compressed JS resource

      assert_equals: decodedBodySize should match the uncompressed JS file size expected 53 but got 0

    • FAIL [expected NOTRUN] subtest: decodedBodySize for deflate-compressed JS resource

      assert_equals: decodedBodySize should match the uncompressed JS file size expected 53 but got 0

    • FAIL [expected NOTRUN] subtest: decodedBodySize equals encodedBodySize for uncompressed resource

      assert_equals: decodedBodySize should match file size for uncompressed resource expected 53 but got 0

    • FAIL [expected NOTRUN] subtest: decodedBodySize for dictionary-compressed brotli (dcb) resource

      assert_equals: The resource should decompress correctly expected "This is compressed test data using a test dictionary" but got "\ufffdDCBS\ufffd\ufffd\ufffd^\ufffd\x0e\x0e\ufffd\ufffd\ufffdk\v&gt;\ufffd\ufffd\ufffdV\ufffd�[\ufffd΃\ufffdbBp\ufffd\x16\ufffd\ufffd\x01\ufffdb\ufffdL\x1d\ufffd\x12\ufffd\ufffd\ufffd\ufffd\ufffd`\"\x07n\ufffd\x05\x14ɷ\ufffdD\ufffd\ufffd\x16\ufffd\x15\x0e\ufffd\ufffd\ufffd43&gt;\r"

    • FAIL [expected NOTRUN] subtest: decodedBodySize for dictionary-compressed zstd (dcz) resource

      assert_equals: The resource should decompress correctly expected "This is compressed test data using a test dictionary" but got "^*M\x18 \0\0\0S\ufffd\ufffd\ufffd^\ufffd\x0e\x0e\ufffd\ufffd\ufffdk\v&gt;\ufffd\ufffd\ufffdV\ufffd�[\ufffd΃\ufffdbBp\ufffd\x16(\ufffd/\ufffd$4\ufffd\0\0\ufffdcompressedata using\x03\0Y\ufffdsTF'&amp;\x10\ufffd\ufffd\ufffd"

  • OK [expected TIMEOUT] /resource-timing/initiator-type/misc.html
    • PASS [expected FAIL] subtest: The initiator type for for fetch() must be 'fetch'
    • FAIL [expected TIMEOUT] subtest: The initiator type for new EventSource() must be 'other'

      promise_test: Unhandled rejection with value: object "Error: observe_entry: timeout"

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github-actions bot commented Jan 4, 2026

⚠️ Try run (#20691771704) failed.

@TimvdLippe
Update WPT expectations
ea61c8d 
Signed-off-by: Tim van der Lippe <[email protected]>
@TimvdLippe TimvdLippe enabled auto-merge January 4, 2026 12:16
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servo-wpt-sync commented Jan 4, 2026

📝 Transplanted new upstreamable changes to existing upstream WPT pull request (web-platform-tests/wpt#56974).

@TimvdLippe TimvdLippe added this pull request to the merge queue Jan 4, 2026
@servo-highfive servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Jan 4, 2026
Merged via the queue into servo:main with commit de27dc6 Jan 4, 2026
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@TimvdLippe TimvdLippe deleted the pending-preload-response-candidate branch January 4, 2026 12:56
@servo-highfive servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Jan 4, 2026
@Loirooriol Loirooriol mentioned this pull request Jan 25, 2026
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@jdm jdm jdm approved these changes

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