Support `font-optical-sizing` #40829

simonwuelker · 2025-11-23T01:40:36Z

This doesn't quite fix the issue in #38642 (comment), I think macos should still have the wrong behaviour for font-optical-sizing: none (but I have no way to verify that).

Manual testcase (fixed by this change)

<style>
@font-face {
  font-family: "Amstelvar VF";
  src: url("https://mdn.github.io/shared-assets/fonts/variable-fonts/AmstelvarAlpha-VF.woff2")
    format("woff2-variations");
  font-weight: 300 900;
}

p {
  font:
    1.2em "Amstelvar VF",
    Georgia,
    serif;
    font-optical-sizing: none;
  font-size: 4rem;
  margin: 1rem;
  display: inline-block;
}

.p1 {
  font-variation-settings: "wght" 300;
  font-optical-sizing: auto;
}

.p2 {
  font-variation-settings: "wght" 300;
  font-optical-sizing: none;
}

</style>
<div>
  <p class="p1">Weight</p>
  <span>(font-optical-sizing: auto)</span>
</div>
<div>
  <p class="p2">Weight</p>
  <span>(font-optical-sizing: none)</span>
</div>

</div>

Testing: We don't run wpt with layout_variable_fonts enabled yet. (But I think we could after this change)
Depends on servo/stylo#271
Part of #38800

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

github-actions · 2025-11-23T01:47:23Z

🔨 Triggering try run (#19604170858) for Linux (WPT)

nicoburns · 2025-11-23T01:48:50Z

It looks like a bunch of other styles (e.g. font-variant-* styles also just map into setting an OpenType feature. Up to you, but it might be easier to combine them into one PR?

github-actions · 2025-11-23T02:20:27Z

Test results for linux-wpt from try job (#19604170858):

Flaky unexpected result (31)

OK /IndexedDB/idbfactory_open.any.html
- FAIL [expected PASS] subtest: Calling open() with version argument 1.5 should not throw.
```
assert_equals: version expected 1 but got 9007199254740991
```

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

ERROR [expected OK] /_mozilla/mozilla/img_load_more_than_cache.html
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"

TIMEOUT [expected FAIL] /css/css-backgrounds/background-size/vector/tall--auto-32px--percent-width-omitted-height.html
FAIL [expected PASS] /css/css-backgrounds/border-image-repeat-space-9.html
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
CRASH [expected ERROR] /encoding/streams/decode-bad-chunks.any.serviceworker.html
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
- 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 [expected ERROR] /focus/focus-event-after-switching-iframes.sub.html (#40368)
OK /html/browsers/history/the-history-interface/traverse_the_history_5.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
CRASH [expected OK] /html/canvas/element/canvas-host/2d.canvas.host.size.attributes.default.html
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
```
OK /html/semantics/forms/form-submission-0/multipart-formdata.window.html (#28725)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in value (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: \n 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 value (normal form)
- PASS [expected FAIL] subtest: text/plain: 0x00 in filename (formdata event)
- PASS [expected FAIL] subtest: text/plain: \r\n 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 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 ""
```
OK [expected CRASH] /html/semantics/forms/the-fieldset-element/disabled-003.html (#31730, #39631)
ERROR [expected OK] /intersection-observer/v2/animated-opacity.html (#40827)
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 domInteractive > Original domInteractive
- PASS [expected FAIL] subtest: Reload fetchStart > Original fetchStart
- PASS [expected FAIL] subtest: Reload loadEventEnd > Original loadEventEnd
- PASS [expected FAIL] subtest: Reload loadEventStart > Original loadEventStart
OK /preload/prefetch-document.html (#37210)
- FAIL [expected PASS] subtest: different-site document prefetch with 'as=document' should not be consumed
```
assert_equals: expected 2 but got 1
```

OK /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

PASS [expected FAIL] subtest: CORS (fetch): main

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=23d2008d-c162-4170-9cd7-1e1f9fe8b195 expected 1 but got 0
```
TIMEOUT /resource-timing/test_resource_timing.html (#25720)
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)
TIMEOUT [expected FAIL] /svg/embedded/image-embedding-nested-data-url-from-canvas-window-load.html
CRASH [expected OK] /trusted-types/eval-csp-no-tt.html
CRASH [expected OK] /trusted-types/should-trusted-type-policy-creation-be-blocked-by-csp-003.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 ERROR] /wasm/webapi/empty-body.any.serviceworker.html
CRASH [expected ERROR] /wasm/webapi/invalid-code.any.sharedworker.html
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

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

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()
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 /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
```
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)
- 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 /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-dest
- PASS [expected FAIL] subtest: sec-fetch-user
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Cross-site
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
OK /fetch/metadata/generated/element-img-environment-change.https.sub.html (#30111)
- FAIL [expected PASS] subtest: sec-fetch-site - Same site, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- FAIL [expected PASS] subtest: sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- FAIL [expected PASS] subtest: sec-fetch-site - Cross-Site -> Same-Site, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- FAIL [expected PASS] subtest: sec-fetch-site - Same-Origin -> Same Origin, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- FAIL [expected PASS] subtest: sec-fetch-mode - attributes: crossorigin=use-credentials
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-user - no attributes
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Same site, no attributes
OK /fetch/metadata/generated/element-img-environment-change.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes
- FAIL [expected PASS] subtest: sec-fetch-site - HTTPS downgrade-upgrade, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
TIMEOUT [expected CRASH] /fetch/metadata/window-open.https.sub.html (#40339)
TIMEOUT [expected CRASH] /html/anonymous-iframe/indexeddb.tentative.https.window.html (#39254)
OK /html/browsers/browsing-the-web/navigating-across-documents/005.html (#27062)
- FAIL [expected PASS] subtest: Link with onclick navigation and href navigation
```
assert_equals: expected "href" but got "click"
```
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"
```
ERROR [expected OK] /html/infrastructure/common-dom-interfaces/collections/domstringlist.html (#40665)
OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html (#29087)
- FAIL [expected TIMEOUT] subtest: <dialog>-contained autofocus element gets focused when the dialog is shown
```
promise_test: Unhandled rejection with value: object "TypeError: can't access property "innerHTML", w.document.body is null"
```
OK [expected CRASH] /html/semantics/embedded-content/media-elements/preserves-pitch.html (#40352)
- FAIL [expected PASS] subtest: Test that preservesPitch is present and unprefixed.
```
assert_true: expected true got false
```
- FAIL [expected PASS] subtest: Test that preservesPitch is on by default
```
assert_true: expected true got undefined
```
- FAIL [expected PASS] subtest: Speed-ups should change the pitch when preservesPitch=false
```
assert_approx_equals: The actual pitch should be close to the expected pitch. expected 880 +/- 132 but got 431.0850439882698
```
- FAIL [expected PASS] subtest: Slow-downs should change the pitch when preservesPitch=false
```
assert_approx_equals: The actual pitch should be close to the expected pitch. expected 220 +/- 33 but got 431.0850439882698
```
OK [expected TIMEOUT] /html/semantics/embedded-content/media-elements/src_object_blob.html (#40340)
- PASS [expected TIMEOUT] subtest: HTMLMediaElement.srcObject blob
CRASH [expected OK] /pointerevents/compat/pointerevent_touch-action_two-finger_interaction.html (#40418)
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.
TIMEOUT [expected OK] /trusted-types/trusted-types-navigation.html?26-30 (#38807)
- PASS [expected FAIL] subtest: Navigate a window via form-submission with javascript:-urls in report-only mode.
- PASS [expected FAIL] subtest: Navigate a frame via form-submission with javascript:-urls in enforcing mode.
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
```
Test timed out
```

Stable unexpected results (5)

OK /css/css-fonts/discrete-no-interpolation.html
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (-0.3) should be [initial]
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (0) should be [initial]
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (0.3) should be [initial]
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (0.5) should be [none]
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (0.6) should be [none]
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (1) should be [none]
- PASS [expected FAIL] subtest: CSS Transitions with transition-behavior:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (1.5) should be [none]
- PASS [expected FAIL] subtest: CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (-0.3) should be [initial]
- PASS [expected FAIL] subtest: CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (0) should be [initial]
- PASS [expected FAIL] subtest: CSS Transitions with transition-property:all and transition-behavor:allow-discrete: property <font-optical-sizing> from [initial] to [none] at (0.3) should be [initial]
- And 25 more unexpected results...
OK /css/css-fonts/font-shorthand-serialization-prevention.html
- FAIL [expected PASS] subtest: Setting font-optical-sizing to none should prevent the font shorthand from serializing in specified style
```
assert_equals: expected "" but got "16px serif"
```
- FAIL [expected PASS] subtest: Setting font-optical-sizing to none should prevent the font shorthand from serializing in computed style
```
assert_equals: expected "" but got "16px serif"
```
OK /css/css-fonts/inheritance.html
- PASS [expected FAIL] subtest: Property font-optical-sizing has initial value auto
- PASS [expected FAIL] subtest: Property font-optical-sizing inherits
OK /css/css-fonts/parsing/font-optical-sizing-computed.html
- PASS [expected FAIL] subtest: Property font-optical-sizing value 'auto'
- PASS [expected FAIL] subtest: Property font-optical-sizing value 'none'
OK /css/css-fonts/parsing/font-optical-sizing-valid.html
- PASS [expected FAIL] subtest: e.style['font-optical-sizing'] = "auto" should set the property value
- PASS [expected FAIL] subtest: e.style['font-optical-sizing'] = "none" should set the property value

github-actions · 2025-11-23T02:20:35Z

⚠️ Try run (#19604170858) failed.

simonwuelker · 2025-11-23T10:42:59Z

It looks like a bunch of other styles (e.g. font-variant-* styles also just map into setting an OpenType feature. Up to you, but it might be easier to combine them into one PR?

I'm currently working towards #37236 which doesn't require the font-variant- properties, but renders incorrectly without font-optical-sizing.

github-actions · 2025-11-23T10:47:34Z

🔨 Triggering try run (#19610010614) for Linux (WPT)

github-actions · 2025-11-23T11:17:47Z

Test results for linux-wpt from try job (#19610010614):

Flaky unexpected result (49)

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/idbfactory_open.any.html
- FAIL [expected PASS] subtest: Calling open() with version argument 1.5 should not throw.
```
assert_equals: version expected 1 but got 9007199254740991
```
PASS [expected FAIL] /_mozilla/css/linear_gradients_reverse_a.html
CRASH [expected OK] /_mozilla/mozilla/preserve_wrapper_callback.html
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"

ERROR [expected TIMEOUT] /_mozilla/webxr/sessionavailable.https.html
OK /_webgl/conformance/textures/misc/texture-upload-size.html (#21770)
- PASS [expected FAIL] subtest: WebGL test #45
- PASS [expected FAIL] subtest: WebGL test #47
- PASS [expected FAIL] subtest: WebGL test #49
- PASS [expected FAIL] subtest: WebGL test #51
- FAIL [expected PASS] subtest: WebGL test #53
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #55
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #57
```
assert_true: Texture was smaller than the expected size 2x2 expected true got false
```
- FAIL [expected PASS] subtest: WebGL test #59
```
assert_true: getError expected: INVALID_VALUE. Was NO_ERROR : when calling texSubImage2D with the same texture upload with offset 1, 1 expected true got false
```
- PASS [expected FAIL] subtest: WebGL test #61
- PASS [expected FAIL] subtest: WebGL test #63
- And 10 more unexpected results...
CRASH [expected OK] /_webgl/conformance2/wasm/readpixels-2gb-in-4gb-wasm-memory.html
TIMEOUT /content-security-policy/inheritance/location-reload.html (#38983)
- PASS [expected FAIL] subtest: location.reload() of empty iframe.
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)
- 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: Newline normalization - \r\n in filename (urlencoded)
CRASH [expected ERROR] /encoding/encodeInto.any.serviceworker.html
CRASH [expected ERROR] /encoding/streams/decode-ignore-bom.any.serviceworker.html
CRASH [expected ERROR] /encoding/streams/decode-non-utf8.any.serviceworker.html

OK /fetch/api/credentials/cookies.any.html (#40672)

FAIL [expected PASS] subtest: Include mode: 1 cookie

assert_equals: Request include cookie(s) expected "a=1" but got "a=1; domain-attribute-matches-host=0"

FAIL [expected PASS] subtest: Include mode: 2 cookies

assert_equals: Request include cookie(s) expected "b=2; c=3" but got "b=2; c=3; domain-attribute-matches-host=0"

FAIL [expected PASS] subtest: Omit mode: no cookie is stored

assert_false: Request does not have cookie(s) expected false got true

FAIL [expected PASS] subtest: Same-origin mode: 1 cookie

assert_equals: Request include cookie(s) expected "a=1" but got "a=1; domain-attribute-matches-host=0"

FAIL [expected PASS] subtest: Same-origin mode: 2 cookies

assert_equals: Request include cookie(s) expected "b=2; c=3" but got "b=2; c=3; domain-attribute-matches-host=0"

CRASH [expected OK] /fetch/api/policies/referrer-unsafe-url-service-worker.https.html
CRASH [expected ERROR] /fetch/http-cache/304-update.any.serviceworker.html
TIMEOUT /fetch/metadata/generated/css-images.sub.tentative.html (#29047)
- TIMEOUT [expected PASS] subtest: background-image sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination
```
Test timed out
```
TIMEOUT [expected CRASH] /fetch/metadata/window-open.https.sub.html (#40339)
CRASH [expected OK] /gamepad/idlharness-extensions.https.window.html
CRASH [expected OK] /html/anonymous-iframe/local-storage-initial-empty-document.tentative.https.window.html

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"

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/origin/origin-keyed-agent-clusters/getter-special-cases/sandboxed-iframe-no.https.html
CRASH [expected OK] /html/browsers/origin/origin-keyed-agent-clusters/regression-1399759.https.sub.html?pipe=header(Origin-Agent-Cluster,%3F0)

OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)

FAIL [expected TIMEOUT] subtest: Element with tabindex should support autofocus
```
assert_equals: expected "SPAN" but got "BODY"
```
PASS [expected NOTRUN] 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;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-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
CRASH [expected OK] /html/semantics/embedded-content/media-elements/autoplay-default-feature-policy.https.sub.html
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)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in name (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 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: Basic File test (formdata event)
- PASS [expected FAIL] subtest: text/plain: 0x00 in value (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: Basic File test (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in value (normal form)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: backslash in name (normal form)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: characters not in encoding in name and value (formdata event)
OK [expected CRASH] /html/semantics/forms/the-fieldset-element/disabled-003.html (#31730, #39631)
CRASH [expected TIMEOUT] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener.html
OK [expected ERROR] /html/user-activation/no-activation-thru-escape-key.html (#40343)

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"])

CRASH [expected OK] /mixed-content/gen/worker-module.http-rp/opt-in/worker-module.https.html
PASS [expected FAIL] /png/apng/acTL-plays-one.html
FAIL [expected PASS] /png/apng/fcTL-dispose-previous.html
CRASH [expected OK] /pointerevents/pointerevent_pointerrawupdate_flush_pointercapture.https.html
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=1abf3ff8-1ee8-4833-bd44-ae069d4a597d expected 1 but got 0
```
CRASH [expected OK] /referrer-policy/4K/gen/top.meta/unsafe-url/a-tag.http.html
CRASH [expected OK] /trusted-types/Node-multiple-arguments.html
CRASH [expected TIMEOUT] /trusted-types/should-trusted-type-policy-creation-be-blocked-by-csp-002.html
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 [expected TIMEOUT] /trusted-types/trusted-types-navigation.html?06-10 (#37920)
- PASS [expected TIMEOUT] subtest: Navigate a frame via anchor with javascript:-urls w/ default policy in report-only mode.
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in enforcing mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```
- FAIL [expected NOTRUN] subtest: Navigate a window via anchor with javascript:-urls w/ a default policy throwing an exception in report-only mode.
```
promise_test: Unhandled rejection with value: "Unexpected message received: \"No securitypolicyviolation reported!\""
```

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

OK /IndexedDB/idbobjectstore_getAll.any.worker.html (#39400)
- PASS [expected FAIL] subtest: Get all values with transaction.commit()

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

FAIL [expected PASS] subtest: offsetTop

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

FAIL [expected PASS] subtest: offsetLeft

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

FAIL [expected PASS] /_mozilla/mozilla/sslfail.html (#10760)
TIMEOUT [expected OK] /_mozilla/mozilla/window_resize_event.html (#36741)
- TIMEOUT [expected PASS] subtest: Popup onresize event fires after resizeTo
```
Test timed out
```
CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
OK /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
```
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)
- FAIL [expected PASS] subtest: @font-face matching for quoted and unquoted generic(nastaliq)
```
assert_equals: quoted generic(nastaliq) matches  @font-face rule expected 30 but got 50
```
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- PASS [expected FAIL] subtest: sec-fetch-dest
- FAIL [expected PASS] subtest: sec-fetch-storage-access - Cross-site
```
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)
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-site 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 /fetch/metadata/generated/element-img-environment-change.https.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-site, no attributes
- FAIL [expected PASS] subtest: sec-fetch-site - Same site, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Cross-Site -> Same-Origin redirect, no attributes
- FAIL [expected PASS] subtest: sec-fetch-site - Same-Origin -> Same-Site -> Same-Origin redirect, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Same Origin, no attributes
- FAIL [expected PASS] subtest: sec-fetch-site - Cross-Site -> Same-Site, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-site - Cross-Site -> Cross-Site, no attributes
- FAIL [expected PASS] subtest: sec-fetch-site - Same-Origin -> Same Origin, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- PASS [expected FAIL] subtest: sec-fetch-site - Same-Origin -> Same-Site, no attributes
- FAIL [expected PASS] subtest: sec-fetch-site - Same-Origin -> Cross-Site, no attributes
```
promise_test: Unhandled rejection with value: object "Error: Failed to query for recorded headers."
```
- And 7 more unexpected results...
OK /fetch/metadata/generated/element-img-environment-change.sub.html (#30111)
- PASS [expected FAIL] subtest: sec-fetch-site - Not sent to non-trustworthy same-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy same-origin destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-mode - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-dest - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-user - Not sent to non-trustworthy cross-site destination, no attributes
- PASS [expected FAIL] subtest: sec-fetch-storage-access - Not sent to non-trustworthy same-origin destination, no attributes
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_3.html (#21383)
- PASS [expected FAIL] subtest: Multiple history traversals, last would be aborted
ERROR [expected OK] /html/infrastructure/common-dom-interfaces/collections/domstringlist.html (#40665)
OK [expected TIMEOUT] /html/interaction/focus/the-autofocus-attribute/autofocus-dialog.html (#29087)
- FAIL [expected TIMEOUT] subtest: <dialog>-contained autofocus element gets focused when the dialog is shown
```
assert_equals: expected "DIV" but got "BODY"
```
OK [expected CRASH] /html/semantics/embedded-content/media-elements/preserves-pitch.html (#40352)
- FAIL [expected PASS] subtest: Test that preservesPitch is present and unprefixed.
```
assert_true: expected true got false
```
- FAIL [expected PASS] subtest: Test that preservesPitch is on by default
```
assert_true: expected true got undefined
```
- FAIL [expected PASS] subtest: Speed-ups should change the pitch when preservesPitch=false
```
assert_approx_equals: The actual pitch should be close to the expected pitch. expected 880 +/- 132 but got 431.0850439882698
```
- FAIL [expected PASS] subtest: Slow-downs should change the pitch when preservesPitch=false
```
assert_approx_equals: The actual pitch should be close to the expected pitch. expected 220 +/- 33 but got 431.0850439882698
```
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)
- PASS [expected FAIL] subtest: Reload domContentLoadedEventEnd > Original domContentLoadedEventEnd
CRASH [expected OK] /pointerevents/compat/pointerevent_touch-action_two-finger_interaction.html (#40418)

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

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 [expected OK] /trusted-types/trusted-types-navigation.html?26-30 (#38807)
- TIMEOUT [expected FAIL] subtest: Navigate a window via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected PASS] subtest: Navigate a window via form-submission with javascript:-urls w/ default policy in report-only mode.
- NOTRUN [expected FAIL] subtest: Navigate a frame via form-submission with javascript:-urls in enforcing mode.
- NOTRUN [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in enforcing mode.
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
OK [expected ERROR] /webxr/render_state_update.https.html (#27535)

github-actions · 2025-11-23T11:17:55Z

✨ Try run (#19610010614) succeeded.

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

yisibl · 2025-12-08T14:21:59Z

The font-weight: 300 900; in the test case is an invalid value. Is this a typo?

simonwuelker · 2025-12-08T23:18:56Z

The font-weight: 300 900; in the test case is an invalid value. Is this a typo?

It should be valid, the two numbers specifiy a range (font-weight: low high) of weights supported by the font. MDN has some examples: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/At-rules/@font-face/font-weight

fonts: Support font-optical-sizing

a12b790

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

simonwuelker requested a review from nicoburns as a code owner November 23, 2025 01:40

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Add support for variable fonts / font variations #38800

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nicoburns approved these changes Nov 23, 2025

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servo-highfive removed the S-awaiting-review There is new code that needs to be reviewed. label Nov 23, 2025

simonwuelker force-pushed the font-optical-sizing-2 branch from 4d55d75 to 48618d2 Compare November 23, 2025 10:47

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bump stylo

e49439c

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

simonwuelker force-pushed the font-optical-sizing-2 branch from 48618d2 to e49439c Compare November 23, 2025 13:34

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simonwuelker enabled auto-merge November 23, 2025 13:34

simonwuelker disabled auto-merge November 23, 2025 13:40

Fix unit tests (canvas tests dont work and idk why)

7b2e0a4

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>

simonwuelker added this pull request to the merge queue Nov 23, 2025

servo-highfive added the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Nov 23, 2025

Merged via the queue into servo:main with commit b204163 Nov 23, 2025
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simonwuelker deleted the font-optical-sizing-2 branch November 23, 2025 14:39

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Nov 23, 2025

mrobinson mentioned this pull request Jan 2, 2026

/css/css-text/ test very flaky since August #40562

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Support `font-optical-sizing` #40829

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