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fetch: implement multipart/form-data parsing for Request::formData()#42041

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Taym95 merged 8 commits intoservo:mainfrom
Taym95:fetch-implement-multipart/form-data-parsing-for-Request-formData
Feb 4, 2026
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fetch: implement multipart/form-data parsing for Request::formData()#42041
Taym95 merged 8 commits intoservo:mainfrom
Taym95:fetch-implement-multipart/form-data-parsing-for-Request-formData

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@Taym95 Taym95 commented Jan 21, 2026 •
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Testing: More test passed in fetch/api/abort/request.any.js.ini

fixes: #25106

@Taym95 Taym95 requested a review from gterzian as a code owner January 21, 2026 00:30
@servo-highfive servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Jan 21, 2026
@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Jan 21, 2026
@github-actions github-actions bot removed the T-linux-wpt Do a try run of the WPT label Jan 21, 2026
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github-actions bot commented Jan 21, 2026

🔨 Triggering try run (#21192534231) for Linux (WPT)

@Taym95 Taym95 force-pushed the fetch-implement-multipart/form-data-parsing-for-Request-formData branch from 382af35 to 2134ec2 Compare January 21, 2026 00:32
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jdm commented Jan 21, 2026

FYI: #25106 (comment) suggests a dependency we could potentially use instead of writing all the parsing routines.

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Taym95 commented Jan 21, 2026

FYI: #25106 (comment) suggests a dependency we could potentially use instead of writing all the parsing routines.

Ah good to knew, I will look at it

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Test results for linux-wpt from try job (#21192534231):

Flaky unexpected result (29)
  • OK /FileAPI/url/url-with-fetch.any.worker.html (#21517)
    • FAIL [expected PASS] subtest: Revoke blob URL after calling fetch, fetch should succeed

      promise_test: Unhandled rejection with value: object "TypeError: Network error: Blob URL store error: InvalidFileID"

  • OK /IndexedDB/get-databases.any.html
    • FAIL [expected PASS] subtest: Enumerate one database.

      promise_test: Unhandled rejection with value: object "Error: indexedDB.open should not succeed without creating a versionchange transaction"

    • FAIL [expected PASS] subtest: Make sure an empty list is returned for the case of no databases.

      promise_test: Unhandled rejection with value: object "Error: indexedDB.open should not succeed without creating a versionchange transaction"

  • OK /IndexedDB/idbfactory-open-error-properties.any.html
    • PASS [expected FAIL] subtest: Properties of error event from failed open()
  • OK /IndexedDB/idbfactory-open-error-properties.any.worker.html
    • PASS [expected FAIL] subtest: Properties of error event from failed open()
  • OK /_mozilla/mozilla/getBoundingClientRect.html (#39668)
    • FAIL [expected PASS] subtest: getBoundingClientRect 1

      assert_equals: expected 62 but got 60.35

  • ERROR [expected TIMEOUT] /_mozilla/webxr/sessionavailable.https.html
  • OK /css/css-cascade/layer-cssom-order-reverse.html (#36094)
    • PASS [expected FAIL] subtest: Delete layer invalidates @font-face
  • OK /css/css-fonts/generic-family-keywords-003.html (#38994)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted monospace (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)
  • OK [expected ERROR] /fetch/fetch-later/quota/cross-origin-iframe/accumulated-oversized-payload.https.window.html
  • OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/sandboxed-iframe.https.window.html (#41704)
  • ERROR /fetch/metadata/generated/serviceworker.https.sub.html (#36247)
    • PASS [expected FAIL] subtest: sec-fetch-site - Same origin, no options - registration
  • OK [expected ERROR] /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
  • CRASH [expected OK] /html/browsers/history/the-history-interface/pushstate-replacestate-empty-string/pushstate-whitespace.html
  • 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
  • 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)
    • FAIL [expected PASS] subtest: multipart/form-data: Basic File test (normal form)

      assert_equals: expected "\r\nContent-Disposition: form-data; name=\"basic\"; filename=\"file-test.txt\"\r\nContent-Type: text/plain\r\n\r\n\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: 0x00 in name (formdata event)
    • PASS [expected FAIL] subtest: text/plain: single quote in name (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: 0x00 in value (normal form)
    • PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in filename (formdata event)
  • CRASH [expected OK] /html/webappapis/user-prompts/print-during-beforeunload.html
  • CRASH [expected TIMEOUT] /resource-timing/resource_subframe_self_navigation.html
  • TIMEOUT /resource-timing/test_resource_timing.html (#25720)
    • FAIL [expected PASS] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)

      assert_equals: expected 5.329999999999998 but got 5.32

    • PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
  • CRASH [expected OK] /trusted-types/TrustedTypePolicyFactory-createPolicy-cspTests.html
  • OK [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?31-35 (#38034)
    • PASS [expected TIMEOUT] 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!\""

  • CRASH [expected OK] /uievents/mouse/mouse_boundary_events_after_reappending_last_over_target.tentative.html
  • TIMEOUT [expected OK] /wasm/core/exceptions/tag.wast.js.html
  • OK /wasm/webapi/abort.any.worker.html (#40013)
    • FAIL [expected PASS] subtest: compileStreaming() asynchronously racing with abort should succeed or reject with AbortError

      assert_equals: expected "AbortError" but got "CompileError"

  • CRASH [expected OK] /webaudio/the-audio-api/the-audioparam-interface/setTargetAtTime-after-event-within-block.html
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 "() => {
      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
  • OK /_mozilla/css/offset_properties_inline.html (#40543)
    • PASS [expected FAIL] subtest: offsetTop
    • PASS [expected FAIL] subtest: offsetLeft
  • 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
  • TIMEOUT /content-security-policy/inheritance/location-reload.html (#38983)
    • PASS [expected FAIL] subtest: location.reload() of empty iframe.
  • OK /css/css-cascade/layer-font-face-override.html (#35935)
    • FAIL [expected PASS] subtest: @font-face override update with appended sheet 1

      assert_equals: expected "80px" but got "38.3166666666667px"

    • FAIL [expected PASS] subtest: @font-face override update with appended sheet 2

      assert_equals: expected "80px" but got "38.3166666666667px"

  • OK /css/css-fonts/generic-family-keywords-001.html (#37467)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(fangsong)
    • 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)
  • OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
    • FAIL [expected PASS] subtest: sec-fetch-user

      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-iframe-contentWindow.html (#28681)
    • FAIL [expected PASS] subtest: load & pageshow events do not fire on contentWindow of <iframe> element created with src='about:blank'

      assert_unreached: load should not be fired Reached unreachable code

  • 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"

  • OK /html/browsers/history/the-history-interface/traverse_the_history_4.html (#21383)
    • PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
  • ERROR [expected TIMEOUT] /html/browsers/history/the-location-interface/location_replace_session_history.html (#41896)
  • 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 <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"

  • 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.
  • 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.
  • ERROR [expected TIMEOUT] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html (#40347)
  • FAIL [expected PASS] /png/apng/acTL-plays-one.html (#41218)
  • OK /preload/prefetch-document.html (#37210)
    • PASS [expected FAIL] subtest: different-site document prefetch with 'as=document' should not be consumed
  • 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 (6)
  • OK /fetch/api/body/formdata.any.html
    • PASS [expected FAIL] subtest: Consume empty response.formData() as FormData
    • PASS [expected FAIL] subtest: Consume empty request.formData() as FormData
  • OK /fetch/api/body/formdata.any.worker.html
    • PASS [expected FAIL] subtest: Consume empty response.formData() as FormData
    • PASS [expected FAIL] subtest: Consume empty request.formData() as FormData
  • OK /fetch/api/request/request-consume.any.html
    • PASS [expected FAIL] subtest: Consume FormData request's body as FormData
  • OK /fetch/api/request/request-consume.any.worker.html
    • PASS [expected FAIL] subtest: Consume FormData request's body as FormData
  • OK /fetch/api/response/response-consume.html
    • PASS [expected FAIL] subtest: Consume response's body: from text with correct multipart type to formData
    • PASS [expected FAIL] subtest: Consume response's body: from blob with correct multipart type to formData
    • PASS [expected FAIL] subtest: Consume response's body: from FormData to formData
    • PASS [expected FAIL] subtest: Consume response's body: from stream with correct multipart type to formData
  • OK /fetch/content-type/multipart.window.html
    • PASS [expected FAIL] subtest: Ensure capital letters can be used in the boundary value.

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github-actions bot commented Jan 21, 2026

⚠️ Try run (#21192534231) failed!

@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Jan 21, 2026
@servo-highfive servo-highfive added the S-needs-rebase There are merge conflict errors. label Jan 21, 2026
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🔨 Triggering try run (#21220431210) for Linux (WPT)

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⚠️ Try run (#21220431210) failed!

@servo-highfive servo-highfive added S-needs-rebase There are merge conflict errors. and removed S-needs-rebase There are merge conflict errors. labels Jan 21, 2026
@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Jan 21, 2026
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🔨 Triggering try run (#21223825354) for Linux (WPT)

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⚠️ Try run (#21223825354) failed!

@Taym95 Taym95 force-pushed the fetch-implement-multipart/form-data-parsing-for-Request-formData branch from 3d3b496 to 67123fa Compare January 21, 2026 22:13
@servo-highfive servo-highfive removed the S-needs-rebase There are merge conflict errors. label Jan 21, 2026
@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Jan 22, 2026
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🔨 Triggering try run (#21231103046) for Linux (WPT)

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⚠️ Try run (#21231103046) failed!

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atouchet commented Jan 22, 2026

FYI: #25106 (comment) suggests a dependency we could potentially use instead of writing all the parsing routines.

Ah good to knew, I will look at it

It's a bit unfortunate how many old duplicate dependencies the textnonce crate adds.

@Taym95 Taym95 force-pushed the fetch-implement-multipart/form-data-parsing-for-Request-formData branch from 69e59b1 to a32af49 Compare January 22, 2026 10:00
@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Jan 22, 2026
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Update test expectation
48bbeef 
Signed-off-by: Taym Haddadi <[email protected]>
@Taym95 Taym95 force-pushed the fetch-implement-multipart/form-data-parsing-for-Request-formData branch from 8b1fac9 to d244148 Compare February 1, 2026 19:39
@servo-highfive servo-highfive added S-awaiting-review There is new code that needs to be reviewed. and removed S-needs-code-changes Changes have not yet been made that were requested by a reviewer. labels Feb 1, 2026
@Taym95
Fix more test
71b4a95 
Signed-off-by: Taym Haddadi <[email protected]>
@Taym95 Taym95 force-pushed the fetch-implement-multipart/form-data-parsing-for-Request-formData branch from d244148 to 71b4a95 Compare February 1, 2026 20:10
@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Feb 1, 2026
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🔨 Triggering try run (#21569460629) for Linux (WPT)

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Test results for linux-wpt from try job (#21569460629):

Flaky unexpected result (30)
  • OK /IndexedDB/idbfactory-open-error-properties.any.html
    • PASS [expected FAIL] subtest: Properties of error event from failed open()
  • OK /IndexedDB/idbfactory-open-error-properties.any.worker.html
    • PASS [expected FAIL] subtest: Properties of error event from failed open()
  • PASS [expected FAIL] /_mozilla/css/linear_gradients_reverse_a.html
  • TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
    • TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo

      Test timed out

  • 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 - \r\n in FormData name (urlencoded)
  • 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 /fetch/content-length/api-and-duplicate-headers.any.worker.html (#35197)
    • FAIL [expected PASS] subtest: fetch() and duplicate Content-Length/Content-Type headers

      promise_test: Unhandled rejection with value: object "TypeError: Network error: HTTP failure: client error (SendRequest)"

  • ERROR [expected OK] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
  • OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/sandboxed-iframe.https.window.html (#41704)
  • OK /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)
    • PASS [expected FAIL] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation
  • CRASH [expected OK] /html/browsers/history/the-location-interface/location-symbol-toprimitive.html
  • CRASH [expected TIMEOUT] /html/browsers/history/the-location-interface/location_replace_session_history.html (#41896)
  • 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 &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 /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
    • PASS [expected FAIL] subtest: Meta refresh of the original iframe is not blocked if moved into a sandboxed iframe
  • TIMEOUT /html/semantics/embedded-content/media-elements/autoplay-allowed-by-feature-policy.https.sub.html (#41404)
    • TIMEOUT [expected PASS] subtest: Feature-Policy header: autoplay * allows same-origin iframes.

      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

  • CRASH [expected OK] /html/semantics/forms/form-submission-0/form-submit-iframe-then-location-navigate.html (#29634)
  • 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/urlencoded2.window.html (#28687)
    • FAIL [expected PASS] subtest: application/x-www-form-urlencoded: Basic test (formdata event)

      assert_equals: expected "basic=test" but got ""

    • 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: 0x00 in filename (normal form)
  • 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 /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 /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
  • ERROR [expected OK] /resource-timing/cors-preflight.any.html (#28694)
  • TIMEOUT /trusted-types/trusted-types-navigation.html?06-10 (#37920)
    • TIMEOUT [expected FAIL] subtest: Navigate a frame via anchor with javascript:-urls in report-only mode.

      Test timed out

    • NOTRUN [expected TIMEOUT] subtest: Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.
  • OK /webdriver/tests/classic/switch_to_frame/switch_webelement.py
    • ERROR [expected PASS] subtest: test_frame_id_webelement_stale_element_reference[top_context]

      teardown error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_webelement_stale_element_reference[child_context]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_webelement_no_frame_element

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected FAIL] subtest: test_frame_id_webelement_frame[0-foo]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected FAIL] subtest: test_frame_id_webelement_frame[1-bar]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_webelement_iframe[0-foo]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_webelement_iframe[1-bar]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_webelement_nested

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_webelement_cloned_into_iframe

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

  • OK [expected TIMEOUT] /webmessaging/with-ports/017.html (#24486)
    • PASS [expected TIMEOUT] subtest: origin of the script that invoked the method, about:blank
  • CRASH [expected ERROR] /webxr/render_state_update.https.html (#27535)
  • ERROR [expected OK] /workers/baseurl/alpha/sharedworker-in-worker.html (#21315)
Stable unexpected results that are known to be intermittent (26)
  • 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"

  • FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
  • 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-font-face-override.html (#35935)
    • FAIL [expected PASS] subtest: @font-face override update with appended sheet 2

      assert_equals: expected "80px" but got "38.3166666666667px"

  • OK /css/css-fonts/generic-family-keywords-001.html (#37467)
    • FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(nastaliq)

      assert_equals: quoted generic(nastaliq) 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 ui-monospace (drawing text in a canvas)
    • PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-rounded (drawing text in a canvas)
  • OK /css/cssom-view/offsetTopLeft-border-box.html (#40826)
    • PASS [expected FAIL] subtest: container: 0
    • PASS [expected FAIL] subtest: container: 1
  • OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
    • PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
    • FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy cross-site destination

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

  • OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.html (#29056)
    • FAIL [expected PASS] subtest: Cross-origin navigation started from unload handler must be ignored

      promise_test: Unhandled rejection with value: object "SecurityError: The operation is insecure."

  • OK /html/browsers/browsing-the-web/navigating-across-documents/replace-before-load/a-click.html (#28697)
    • FAIL [expected PASS] subtest: aElement.click() before the load event must NOT replace

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

  • OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
    • PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
  • OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/update-the-rendering.html (#24145)
    • FAIL [expected TIMEOUT] subtest: "Flush autofocus candidates" should be happen before a scroll event and animation frame callbacks

      assert_array_equals: animationFrame lengths differ, expected array ["autofocus", "scroll", "animationFrame"] length 3, got ["animationFrame"] length 1

  • 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
  • TIMEOUT /html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html (#41221)
    • TIMEOUT [expected FAIL] subtest: Feature-Policy header: autoplay "none" disallows same-origin iframes.

      Test timed out

  • OK /navigation-timing/test-navigation-type-reload.html (#33334)
    • FAIL [expected PASS] subtest: Reload domComplete &gt; Original domComplete

      assert_true: Reload domComplete &gt; Original domComplete expected true got false

    • FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd

      assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false

    • FAIL [expected PASS] subtest: Reload loadEventEnd &gt; Original loadEventEnd

      assert_true: Reload loadEventEnd &gt; Original loadEventEnd expected true got false

    • FAIL [expected PASS] subtest: Reload loadEventStart &gt; Original loadEventStart

      assert_true: Reload loadEventStart &gt; Original loadEventStart expected true got false

  • OK /resource-timing/test_resource_timing.html (#25720)
    • PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)
    • FAIL [expected NOTRUN] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (link)

      assert_equals: expected 3.650000000000002 but got 3.64

    • PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
  • OK /resource-timing/test_resource_timing.https.html (#25216)
    • FAIL [expected PASS] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)

      assert_equals: expected 9.950000000000003 but got 9.95

  • OK /touch-events/single-tap-when-touchend-listener-use-sync-xhr.html (#41175)
    • PASS [expected FAIL] subtest: Click event should be fired when touchend opens synchronous XHR
  • TIMEOUT /trusted-types/trusted-types-navigation.html?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.
Stable unexpected results (1)
  • OK /fetch/api/response/response-consume.html
    • FAIL [expected PASS] subtest: Consume response's body: from FormData to blob

      assert_equals: Blob body type should be computed from the response Content-Type expected "multipart/form-data; boundary=---------------------------12224368443209987866" but got "multipart/form-data;boundary=---------------------------12224368443209987866"

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github-actions bot commented Feb 1, 2026

⚠️ Try run (#21569460629) failed!

@Taym95 Taym95 added the T-linux-wpt Do a try run of the WPT label Feb 2, 2026
@Taym95 Taym95 requested a review from jdm February 2, 2026 21:29
@servo-highfive servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Feb 3, 2026
@jdm jdm added T-linux-wpt Do a try run of the WPT and removed T-linux-wpt Do a try run of the WPT labels Feb 3, 2026
@github-actions github-actions bot removed the T-linux-wpt Do a try run of the WPT label Feb 3, 2026
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github-actions bot commented Feb 3, 2026

🔨 Triggering try run (#21615725352) for Linux (WPT)

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github-actions bot commented Feb 3, 2026

Test results for linux-wpt from try job (#21615725352):

Flaky unexpected result (39)
  • 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 /IndexedDB/idbfactory-open-error-properties.any.html
    • PASS [expected FAIL] subtest: Properties of error event from failed open()
  • OK /IndexedDB/idbfactory-open-error-properties.any.worker.html
    • PASS [expected FAIL] subtest: Properties of error event from failed open()
  • OK /_mozilla/mozilla/getBoundingClientRect.html (#39668)
    • FAIL [expected PASS] subtest: getBoundingClientRect 1

      assert_equals: expected 62 but got 60.35

  • CRASH [expected OK] /_webgl/conformance/canvas/canvas-zero-size.html
  • CRASH [expected OK] /_webgl/conformance2/wasm/readpixels-2gb-in-4gb-wasm-memory.html
  • 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-animations/event-order.tentative.html (#39000)
    • PASS [expected FAIL] subtest: Same events on pseudo-elements follow the prescribed order
  • FAIL [expected PASS] /css/css-backgrounds/background-size-041.html
  • OK /css/css-fonts/generic-family-keywords-002.html (#40929)
    • FAIL [expected PASS] subtest: font-family: -webkit-serif treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • FAIL [expected PASS] subtest: font-family: -webkit-sans-serif treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • FAIL [expected PASS] subtest: font-family: -webkit-cursive treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • FAIL [expected PASS] subtest: font-family: -webkit-fantasy treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • FAIL [expected PASS] subtest: font-family: -webkit-monospace treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • FAIL [expected PASS] subtest: font-family: -webkit-system-ui treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • FAIL [expected PASS] subtest: font-family: -webkit-math treated as &lt;font-family&gt;, not &lt;generic-name&gt;

      assert_equals: expected 30 but got 50

    • PASS [expected FAIL] subtest: font-family: -webkit-generic(fangsong) treated as &lt;font-family&gt;, not &lt;generic-name&gt;
    • PASS [expected FAIL] subtest: font-family: -webkit-generic(kai) treated as &lt;font-family&gt;, not &lt;generic-name&gt;
    • PASS [expected FAIL] subtest: font-family: -webkit-generic(khmer-mul) treated as &lt;font-family&gt;, not &lt;generic-name&gt;
    • And 12 more unexpected results...
  • 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 - \r\n in value (formdata)
  • CRASH [expected OK] /fetch/metadata/generated/element-iframe.https.sub.html (#40341)
  • ERROR [expected OK] /fetch/metadata/window-open.https.sub.html (#40339)
  • CRASH [expected OK] /html/browsers/browsing-the-web/history-traversal/001.html
  • CRASH [expected OK] /html/browsers/browsing-the-web/history-traversal/window-name-after-cross-origin-sub-frame-navigation.sub.html
  • 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
  • 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 /html/semantics/embedded-content/media-elements/autoplay-disabled-by-feature-policy.https.sub.html (#41221)
    • TIMEOUT [expected FAIL] subtest: Feature-Policy header: autoplay "none" disallows same-origin iframes.

      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/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/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: 0x00 in value (normal form)
    • PASS [expected FAIL] subtest: text/plain: 0x00 in filename (formdata event)
  • OK [expected ERROR] /html/user-activation/no-activation-thru-escape-key.html (#40343)
  • CRASH [expected OK] /html/webappapis/scripting/processing-model-2/window-onerror-with-cross-frame-event-listeners-5.html
  • 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/video-upgrade.https.sub.html (#41135)
    • FAIL [expected PASS] subtest: Video of other host autoupgraded

      assert_equals: Length. Other host expected 1 but got Infinity

  • PASS [expected FAIL] /png/apng/acTL-plays-one.html (#41218)
  • 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 [expected OK] /trusted-types/trusted-types-navigation.html?01-05 (#38975)
    • TIMEOUT [expected PASS] subtest: Navigate a window via anchor with javascript:-urls in report-only mode.

      Test timed out

    • NOTRUN [expected PASS] subtest: Navigate a window via anchor with javascript:-urls w/ default policy in report-only mode.
    • NOTRUN [expected PASS] subtest: Navigate a frame via anchor with javascript:-urls in enforcing mode.
  • OK /visual-viewport/resize-event-order.html (#41981)
    • PASS [expected FAIL] subtest: Popup: DOMWindow resize fired before VisualViewport.
  • OK /webdriver/tests/classic/delete_all_cookies/user_prompts.py
    • FAIL [expected PASS] subtest: test_accept[alert-None]

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

  • OK /webdriver/tests/classic/delete_cookie/delete.py
    • FAIL [expected PASS] subtest: test_null_response_value

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

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

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

  • OK /webdriver/tests/classic/execute_async_script/objects.py
    • FAIL [expected PASS] subtest: test_object

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

  • OK /webdriver/tests/classic/execute_script/cyclic.py
    • FAIL [expected PASS] subtest: test_collection_self_reference

      assert 404 == 500

  • OK /webdriver/tests/classic/execute_script/promise.py
    • FAIL [expected PASS] subtest: test_promise_resolve

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

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

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

  • OK /webdriver/tests/classic/switch_to_frame/switch_number.py
    • ERROR [expected PASS] subtest: test_frame_id_number_index_out_of_bounds[1]

      teardown error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_number_index_out_of_bounds[65535]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_number_index[0-foo]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_number_index[1-bar]

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

    • ERROR [expected PASS] subtest: test_frame_id_number_index_nested

      setup error: ConnectionRefusedError: [Errno 111] Connection refused

  • CRASH [expected OK] /workers/Worker-messageport.html
  • CRASH [expected OK] /workers/Worker_ErrorEvent_lineno.htm
Stable unexpected results that are known to be intermittent (31)
  • 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
  • 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 /css/css-cascade/layer-font-face-override.html (#35935)
    • 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 sans-serif (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 ui-rounded (drawing text in a canvas)
  • OK /css/cssom-view/offsetTopLeft-border-box.html (#40826)
    • PASS [expected FAIL] subtest: container: 0
    • PASS [expected FAIL] subtest: container: 1
  • 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)
    • FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy cross-site destination

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

  • ERROR /fetch/metadata/generated/serviceworker.https.sub.html (#36247)
    • FAIL [expected PASS] subtest: sec-fetch-site - Same origin, no options - registration

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

  • OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-cross-origin.sub.window.html (#29056)
    • FAIL [expected PASS] subtest: Cross-origin navigation started from unload handler must be ignored

      promise_test: Unhandled rejection with value: object "SecurityError: The operation is insecure."

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

      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 &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 /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
    • PASS [expected FAIL] subtest: Meta refresh of the original iframe is not blocked if moved into a sandboxed iframe
  • CRASH [expected OK] /html/semantics/forms/form-submission-0/form-submit-iframe-then-location-navigate.html (#29634)
  • TIMEOUT [expected ERROR] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html (#40347)
  • OK /navigation-timing/test-navigation-type-reload.html (#33334)
    • FAIL [expected PASS] subtest: Reload domComplete &gt; Original domComplete

      assert_true: Reload domComplete &gt; Original domComplete expected true got false

    • FAIL [expected PASS] subtest: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd

      assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false

    • 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
    • FAIL [expected PASS] subtest: Reload loadEventEnd &gt; Original loadEventEnd

      assert_true: Reload loadEventEnd &gt; Original loadEventEnd expected true got false

    • FAIL [expected PASS] subtest: Reload loadEventStart &gt; Original loadEventStart

      assert_true: Reload loadEventStart &gt; Original loadEventStart expected true got false

  • OK /resource-timing/test_resource_timing.html (#25720)
    • FAIL [expected NOTRUN] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (link)

      assert_equals: expected 4.630000000000003 but got 4.63

  • OK /resource-timing/test_resource_timing.https.html (#25216)
    • FAIL [expected PASS] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)

      assert_equals: expected 9.950000000000003 but got 9.95

  • TIMEOUT [expected OK] /webstorage/localstorage-about-blank-3P-iframe-opens-3P-window.partitioned.html (#29053)
    • TIMEOUT [expected PASS] subtest: StorageKey: test 3P about:blank window opened from a 3P iframe

      Test timed out

Stable unexpected results (1)
  • OK /fetch/api/response/response-consume.html
    • FAIL [expected PASS] subtest: Consume response's body: from FormData to blob

      assert_equals: Blob body type should be computed from the response Content-Type expected "multipart/form-data; boundary=---------------------------16318468271676088285" but got "multipart/form-data;boundary=---------------------------16318468271676088285"

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github-actions bot commented Feb 3, 2026

⚠️ Try run (#21615725352) failed!

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sebsebmc commented Feb 3, 2026

Nice job, I took a look at this a long time ago and it's very underspecified. The other browsers all disagree on how strict the parsing for this should be.

@servo-highfive servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Feb 3, 2026
@Taym95 Taym95 added this pull request to the merge queue Feb 3, 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 Feb 3, 2026
Merged via the queue into servo:main with commit b18d119 Feb 4, 2026
32 checks passed
@Taym95 Taym95 deleted the fetch-implement-multipart/form-data-parsing-for-Request-formData branch February 4, 2026 00:27
@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 Feb 4, 2026
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@jdm jdm jdm approved these changes

@gterzian gterzian Awaiting requested review from gterzian gterzian is a code owner

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MIME handling of multipart form data isn't working in several cases

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@Taym95 @jdm @atouchet @sebsebmc @servo-highfive