Add test tracking web-exposed CSS properties by Loirooriol · Pull Request #42385 · servo/servo

Loirooriol · 2026-02-06T02:45:31Z

When doing a Stylo upgrade, it may happen that a commit imported from upstream accidentally enables a CSS property on Servo. That is even more likely after https://phabricator.services.mozilla.com/D280900, since the new default is that properties are enabled everywhere.

Therefore, this test will help detect these accidents. Ideally, the test would only track CSS properties exposed to stable, but that requires running the test without experimental features, or using internal APIs. So for now, the test will also track experimental properties.

Testing: just adding a new test, no behavior change

When doing a Stylo upgrade, it may happen that a commit imported from upstream accidentally enables a CSS property on Servo. That is even more likely after https://phabricator.services.mozilla.com/D280900, since the new default is that properties are enabled everywhere. Therefore, this test will help detect these accidents. Ideally, the test would only track CSS properties exposed to stable, but that requires running the test without experimental features, or using internal APIs. So for now, the test will also track experimental properties. Signed-off-by: Oriol Brufau <[email protected]>

github-actions · 2026-02-06T02:45:48Z

🔨 Triggering try run (#21736773972) for Linux (WPT)

github-actions · 2026-02-06T03:18:12Z

Test results for linux-wpt from try job (#21736773972):

Flaky unexpected result (36)

OK /IndexedDB/idbfactory-databases-opaque-origin.html
- FAIL [expected PASS] subtest: IDBFactory.databases() in non-sandboxed iframe should not reject
```
assert_equals: IDBFactory.databases() should not reject expected "no exception" but got "OperationError"
```
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()
TIMEOUT [expected OK] /_mozilla/mozilla/preserve_wrapper_callback.html
CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
CRASH [expected OK] /_webgl/conformance/ogles/GL/functions/functions_025_to_032.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 = string
```
assert_false: expected false got true
```
FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
OK /css/css-fonts/generic-family-keywords-002.html (#40929)
- FAIL [expected PASS] subtest: font-family: -webkit-serif treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-sans-serif treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-cursive treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-fantasy treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-monospace treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-system-ui treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- FAIL [expected PASS] subtest: font-family: -webkit-math treated as <font-family>, not <generic-name>
```
assert_equals: expected 30 but got 50
```
- PASS [expected FAIL] subtest: font-family: -webkit-generic(fangsong) treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-generic(kai) treated as <font-family>, not <generic-name>
- PASS [expected FAIL] subtest: font-family: -webkit-generic(khmer-mul) treated as <font-family>, not <generic-name>
- And 12 more unexpected results...
OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
- PASS [expected FAIL] subtest: Single value - empty name exists
- PASS [expected FAIL] subtest: setFormValue with an empty FormData should submit nothing
ERROR [expected OK] /fetch/fetch-later/quota/same-origin-iframe/multiple-iframes.https.window.html (#35176)
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin-fragment.html (#20768)
- PASS [expected FAIL] subtest: Tests that a fragment navigation in the unload handler will not block the initial navigation
OK /html/browsers/browsing-the-web/navigating-across-documents/navigation-unload-same-origin.window.html (#29049)
- PASS [expected FAIL] subtest: Same-origin navigation started from unload handler must be ignored
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 OK] /html/browsers/windows/auxiliary-browsing-contexts/opener-setter.html
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 [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-nonexistent.html (#28259)
- TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with non-existent fragments should work.
```
Test timed out
```
OK /html/semantics/document-metadata/the-meta-element/pragma-directives/attr-meta-http-equiv-refresh/allow-scripts-flag-changing-2.html (#39703)
- 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/preserves-pitch.html (#40352)
- PASS [expected TIMEOUT] subtest: Speed-ups should not change the pitch when preservesPitch=true
- PASS [expected NOTRUN] subtest: Slow-downs should not change the pitch when preservesPitch=true
- TIMEOUT [expected NOTRUN] subtest: Speed-ups should change the pitch when preservesPitch=false
```
Test timed out
```
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 ""
```
- 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 ""
```
- PASS [expected FAIL] subtest: multipart/form-data: double quote in value (normal form)
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 (normal form)
- PASS [expected FAIL] subtest: text/plain: 0x00 in value (normal form)
- PASS [expected FAIL] subtest: text/plain: \r\n in name (normal form)
- PASS [expected FAIL] subtest: text/plain: \r\n in value (formdata event)
TIMEOUT [expected OK] /html/user-activation/navigation-state-reset-sameorigin.html
- TIMEOUT [expected PASS] subtest: Post-navigation state reset.
```
Test timed out
```
CRASH [expected OK] /html/webappapis/scripting/processing-model-2/window-onerror-with-cross-frame-event-listeners-5.html
OK /navigation-timing/test-timing-reload.html
- FAIL [expected PASS] subtest: domInteractive is different after the reload.
```
assert_not_equals: domInteractive is different after the reload. got disallowed value 2.12
```
CRASH [expected TIMEOUT] /referrer-policy/gen/top.meta/unsafe-url/svg-a-tag.http.html
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.
PASS [expected TIMEOUT] /visual-viewport/viewport-apply-initial-scale-after-navigation.html (#41582)
OK /webdriver/tests/classic/element_click/navigate.py
- FAIL [expected PASS] subtest: test_numbers_link
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/execute_async_script/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
```

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)
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)
- PASS [expected FAIL] subtest: @font-face override update with appended sheet 1
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 generic(nastaliq) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted ui-rounded (drawing text in a canvas)
OK /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)
- FAIL [expected PASS] subtest: sec-fetch-user
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/generated/css-font-face.sub.tentative.html (#34624)
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-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/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-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 [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"

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 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 domContentLoadedEventEnd > Original domContentLoadedEventEnd
```
assert_true: Reload domContentLoadedEventEnd &gt; Original domContentLoadedEventEnd expected true got false
```
OK /resource-timing/test_resource_timing.html (#25720)
- PASS [expected FAIL] subtest: window.performance.getEntriesByName() and window.performance.getEntriesByNameType() return same data (iframe)
- FAIL [expected NOTRUN] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (link)
```
assert_equals: expected 7.350000000000001 but got 7.34
```
OK /resource-timing/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: window.performance.getEntriesByName() and window.performance.getEntriesByNameType() return same data (iframe)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (iframe)
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.

github-actions · 2026-02-06T03:18:48Z

✨ Try run (#21736773972) succeeded.

Loirooriol added the T-linux-wpt Do a try run of the WPT label Feb 6, 2026

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Feb 6, 2026

github-actions bot removed the T-linux-wpt Do a try run of the WPT label Feb 6, 2026

Loirooriol enabled auto-merge February 6, 2026 02:45

jdm approved these changes Feb 6, 2026

View reviewed changes

servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Feb 6, 2026

Loirooriol added this pull request to the merge queue Feb 6, 2026

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

github-merge-queue bot removed this pull request from the merge queue due to failed status checks Feb 6, 2026

servo-highfive added S-tests-failed The changes caused existing tests to fail. and removed S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. labels Feb 6, 2026

Loirooriol added this pull request to the merge queue Feb 6, 2026

servo-highfive added S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. and removed S-tests-failed The changes caused existing tests to fail. labels Feb 6, 2026

Merged via the queue into servo:main with commit 4d0606c Feb 6, 2026
75 checks passed

Loirooriol deleted the css-property-listing branch February 6, 2026 05:33

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

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Add test tracking web-exposed CSS properties#42385

Add test tracking web-exposed CSS properties#42385
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