paint: Unify scrolling/pinch zoom behaviour across platforms by yezhizhen · Pull Request #42387 · servo/servo

yezhizhen · 2026-02-06T05:15:06Z

There has been a weird discrepancy between headed/headless test automation,
as stated in #42386 and #42320 (comment).
The problem identified is more general than the intial issue:
we need to use CSS Pixel and Device Pixel consistently in these cases.

Convert threshold unit to ensure cross-platform consistency.
Adjust TOUCH_PAN_MIN_SCREEN_PX: this is tested on Android/Ohos,
to match the pinch/scrolling threshold of Firefox/Chrome.

This is critical for test automation which always relies on CSS pixel.

Testing: Added which ensures pinch zoom does happen, and there is no crash for #42320.
Fixes: #42386

github-actions · 2026-02-06T05:15:51Z

🔨 Triggering try run (#21739616810) for Linux (WPT)

github-actions · 2026-02-06T05:44:14Z

Test results for linux-wpt from try job (#21739616810):

Flaky unexpected result (32)

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-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 /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.
FAIL [expected PASS] /css/css-backgrounds/background-size-042.html
TIMEOUT /fetch/metadata/generated/css-images.sub.tentative.html (#29047)
- TIMEOUT [expected PASS] subtest: background-image sec-fetch-site - Not sent to non-trustworthy same-origin destination
```
Test timed out
```
- TIMEOUT [expected PASS] subtest: background-image sec-fetch-dest - Not sent to non-trustworthy cross-site destination
```
Test timed out
```
- FAIL [expected PASS] subtest: content sec-fetch-site - HTTPS downgrade-upgrade
```
assert_unreached: Reached unreachable code
```
OK [expected ERROR] /focus/focus-event-after-switching-iframes.sub.html (#40368)
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/refresh/same-document-refresh.html (#34597)

FAIL [expected PASS] subtest: Same-Document Referrer from Refresh

assert_equals: original page loads expected "http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/refresh/resources/refresh-with-section.sub.html?url=%23section" but got "http://web-platform.test:8000/html/browsers/browsing-the-web/navigating-across-documents/refresh/resources/refresh-with-section.sub.html?url=%23section#section"

CRASH [expected OK] /html/browsers/browsing-the-web/unloading-documents/beforeunload-on-history-back.html
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/windows/browsing-context-names/duplicate-name-order.html (#34623)
- PASS [expected FAIL] subtest: Duplicate name lookup order
TIMEOUT [expected OK] /html/interaction/focus/the-autofocus-attribute/document-with-fragment-top.html (#28259)
- TIMEOUT [expected FAIL] subtest: Autofocus elements in top-level browsing context's documents with "top" fragments should work.
```
Test timed out
```
TIMEOUT /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
```

OK /html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-nav-location-assign.html (#32863)

FAIL [expected PASS] subtest: Navigating iframe loading='lazy' before it is loaded: location.assign

uncaught exception: Error: assert_equals: expected "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?nav" but got "http://web-platform.test:8000/html/semantics/embedded-content/the-iframe-element/support/blank.htm?src"

TIMEOUT [expected OK] /html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigate_other_frame_popup.sub.html (#39702)
- TIMEOUT [expected FAIL] subtest: Sandboxed iframe can not navigate other frame's popup
```
Test timed out
```
OK /html/semantics/forms/form-submission-0/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.
TIMEOUT [expected ERROR] /html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html (#40347)
TIMEOUT [expected OK] /html/user-activation/propagation-sameorigin.html
- NOTRUN [expected PASS] subtest: Propagation test
OK /html/webappapis/dynamic-markup-insertion/document-write/module-dynamic-import.html
- FAIL [expected PASS] subtest: document.write in an imported module
```
assert_true: onload must be called expected true got false
```
FAIL [expected PASS] /png/apng/fcTL-dispose-previous-final.html (#41837)
TIMEOUT /trusted-types/trusted-types-navigation.html?06-10 (#37920)
- PASS [expected FAIL] subtest: Navigate a frame via anchor with javascript:-urls in report-only mode.
TIMEOUT /trusted-types/trusted-types-navigation.html?31-35 (#38034)
- TIMEOUT [expected PASS] subtest: Navigate a frame via form-submission with javascript:-urls in report-only mode.
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Navigate a frame via form-submission with javascript:-urls w/ default policy in report-only mode.
OK /visual-viewport/resize-event-order.html (#41981)
- PASS [expected FAIL] subtest: Popup: DOMWindow resize fired before VisualViewport.
OK /webdriver/tests/classic/delete_session/delete.py
- FAIL [expected PASS] subtest: test_accepted_beforeunload_prompt
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/execute_script/window.py
- FAIL [expected PASS] subtest: test_web_reference[frame]
```
AssertionError: no such window (404): No such window
```
OK /webdriver/tests/classic/get_element_rect/user_prompts.py
- FAIL [expected PASS] subtest: test_accept[alert-None]
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/navigate_to/user_prompts.py
- FAIL [expected PASS] subtest: test_accept[alert]
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/perform_actions/pointer_pause_dblclick.py
- FAIL [expected PASS] subtest: test_dblclick_with_pause_after_second_pointerdown
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK /webdriver/tests/classic/perform_actions/wheel.py
- FAIL [expected PASS] subtest: test_null_response_value
```
webdriver.error.NoSuchWindowException: no such window (404): No such window
```
OK [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 (33)

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
```
CRASH [expected PASS] /_mozilla/shadow-dom/move-element-with-ua-shadow-tree-crash.html (#39473)
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 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 generic(fangsong) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(kai) (drawing text in a canvas)
- PASS [expected FAIL] subtest: @font-face matching for quoted and unquoted generic(khmer-mul) (drawing text in a canvas)
OK /css/cssom-view/offsetTopLeft-border-box.html (#40826)
- PASS [expected FAIL] subtest: container: 0
- PASS [expected FAIL] subtest: container: 1
OK /custom-elements/form-associated/ElementInternals-setFormValue.html (#29174)
- PASS [expected FAIL] subtest: Single value - empty name exists
- PASS [expected FAIL] subtest: Single value - Non-empty name exists
- PASS [expected FAIL] subtest: Null value should submit nothing
- PASS [expected FAIL] subtest: Multiple values - name content attribute is ignored
- PASS [expected FAIL] subtest: setFormValue with an empty FormData should submit nothing
- PASS [expected FAIL] subtest: Newline normalization - \r\n in name (urlencoded)
- PASS [expected FAIL] subtest: Newline normalization - \n in value (formdata)
- PASS [expected FAIL] subtest: Newline normalization - \r\n in value (urlencoded)
- PASS [expected FAIL] subtest: Newline normalization - \r\n in value (formdata)
- PASS [expected FAIL] subtest: Newline normalization - \r\n in filename (urlencoded)
- And 5 more unexpected results...
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/accumulated-oversized-payload.https.window.html (#41705)
OK [expected ERROR] /fetch/fetch-later/quota/same-origin-iframe/sandboxed-iframe.https.window.html (#41704)
OK /fetch/metadata/generated/css-font-face.https.sub.tentative.html (#32732)
- 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."
```
- 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/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"

TIMEOUT /html/interaction/focus/the-autofocus-attribute/supported-elements.html (#24145)
- TIMEOUT [expected FAIL] subtest: Element with tabindex should support autofocus
```
Test timed out
```
- NOTRUN [expected TIMEOUT] subtest: Non-HTMLElement should not support autofocus
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
```
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 /html/semantics/forms/form-submission-0/multipart-formdata.window.html (#28725)
- PASS [expected FAIL] subtest: multipart/form-data: Basic File test (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in name (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in name (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in value (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in value (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in filename (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: 0x00 in filename (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: \n in value (normal form)
- PASS [expected FAIL] subtest: multipart/form-data: \n in value (formdata event)
- PASS [expected FAIL] subtest: multipart/form-data: \r\n in value (normal form)
- And 19 more unexpected results...
OK /html/semantics/forms/form-submission-0/text-plain.window.html (#28687)
- PASS [expected FAIL] subtest: text/plain: Basic File test (formdata event)
- PASS [expected FAIL] subtest: text/plain: 0x00 in name (normal form)
- PASS [expected FAIL] subtest: text/plain: 0x00 in name (formdata event)
- PASS [expected FAIL] subtest: text/plain: 0x00 in value (normal form)
- PASS [expected FAIL] subtest: text/plain: 0x00 in value (formdata event)
- PASS [expected FAIL] subtest: text/plain: 0x00 in filename (normal form)
- PASS [expected FAIL] subtest: text/plain: 0x00 in filename (formdata event)
- PASS [expected FAIL] subtest: text/plain: \r\n in name (normal form)
- PASS [expected FAIL] subtest: text/plain: \r\n in name (formdata event)
- PASS [expected FAIL] subtest: text/plain: \r\n in value (normal form)
- And 25 more unexpected results...
OK /html/semantics/forms/form-submission-0/urlencoded2.window.html (#28687)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: Basic File test (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in name (normal form)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in name (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: 0x00 in value (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in filename (normal form)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: 0x00 in filename (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: \r\n in name (normal form)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: \r\n in name (formdata event)
- PASS [expected FAIL] subtest: application/x-www-form-urlencoded: \r\n in value (normal form)
- And 31 more unexpected results...
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/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
OK /resource-timing/test_resource_timing.html (#25720)
- 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 (img)
- FAIL [expected NOTRUN] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (link)
```
assert_equals: expected 5.449999999999999 but got 5.45
```
OK /resource-timing/test_resource_timing.https.html (#25216)
- PASS [expected FAIL] subtest: window.performance.getEntriesByName() and window.performance.getEntriesByNameType() return same data (iframe)
- FAIL [expected PASS] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (img)
```
assert_equals: expected 20.08999999999999 but got 20.09
```
- PASS [expected FAIL] subtest: PerformanceEntry has correct name, initiatorType, startTime, and duration (xmlhttprequest)
OK /service-workers/service-worker/fetch-event.https.html (#36234)
- PASS [expected FAIL] subtest: Service Worker falls back to network in fetch event with POST form

github-actions · 2026-02-06T05:44:34Z

✨ Try run (#21739616810) succeeded.

yezhizhen · 2026-02-06T06:01:25Z

Will add a crash test.

yezhizhen · 2026-02-06T10:03:48Z

While trying to add a testdriver test so that we do not interfere with Python WebDriver conformance, I find another really interesting (well painful as I went nuts in past few hours why it keeps TIMEOUT but python conformance won't..) bug, which if solved can help us unblock many pinch zoom tests:

servo/tests/wpt/tests/css/cssom-view/support/action-utils.js

Line 1 in 10209cc

async function pinch_zoom_action(targetWindow = window) {

This thing keeps timeout. It seems we never sent back crossbeam response to server for some touchup actions.

yezhizhen · 2026-02-06T10:06:54Z

I find another really interesting ... bug

It also means we cannot use the existing pinch_zoom_action, which has None duration for PointerMove and would hit

servo/components/webdriver_server/actions.rs

Lines 521 to 523 in 10209cc

    
           let duration = match action.duration { 
        
               Some(duration) => duration, 
        
               None => tick_duration,

We want something with 0 duration. This is very subtle, I believe no other tests have ever tried this.

yezhizhen · 2026-02-06T10:29:18Z

Another bug in testdriver harness:

    .pointerMove(x - 150, y - 150, {origin: "viewport", sourceName: "f1", duration: 0.0})

It seems 0 duration is regarded as None.. But duration 0.8 works.

servo/tests/wpt/tests/resources/testdriver-actions.js

Lines 547 to 549 in 10209cc

    
           if (duration) { 
        
             moveAction.duration = duration; 
        
           }

…s-video_touch.html` (#42405) The syntax is wrong. We cannot pass an Element as duration. Only Firefox [was passing this](https://wpt.fyi/results/pointerevents/pointerevent_touch-propagates-when-target-is-video_touch.html?run_id=5098406608633856&run_id=5170937667518464&run_id=4715813002280960&run_id=5136051728547840), which is a bug of geckodriver: Testing: Updated expectation of existing tests. This blocks #42398, #42387. Signed-off-by: Euclid Ye <[email protected]>

Previously, even if you explicitly set duration 0, it still ends up with `None`. But you can set duration 0 in wdspec python tests. This complies with [spec](https://w3c.github.io/webdriver/#dfn-process-a-wheel-action:~:text=If%20duration%20is%20not%20undefined%20and%20duration%20is%20not%20an%20Integer%20greater%20than%20or%20equal%20to%200%2C%20return%20error%20with%20error%20code%20invalid%20argument%2E): duration can be greater than or equal to 0. Testing: There is no existing testdriver tests that use duration 0. Fixes: web-platform-tests/wpt#57606 Found in: #42387 (comment) --------- Signed-off-by: Euclid Ye <[email protected]>

Signed-off-by: Euclid Ye <[email protected]>

servo-wpt-sync · 2026-02-08T16:29:12Z

🤖 Opened new upstream WPT pull request (web-platform-tests/wpt#57642) with upstreamable changes.

servo-wpt-sync · 2026-02-08T16:30:22Z

✍ Updated existing upstream WPT pull request (web-platform-tests/wpt#57642) title and body.

Signed-off-by: Euclid Ye <[email protected]>

yezhizhen · 2026-02-08T16:38:56Z

@TimvdLippe Would you like to review the newly added test too? Thanks.

servo-wpt-sync · 2026-02-08T16:40:32Z

📝 Transplanted new upstreamable changes to existing upstream WPT pull request (web-platform-tests/wpt#57642).

yezhizhen requested review from mrobinson and xiaochengh February 6, 2026 05:15

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

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

TimvdLippe approved these changes Feb 6, 2026

View reviewed changes

yezhizhen mentioned this pull request Feb 6, 2026

testdriver harness: Allow duration 0 for actions/tick #42398

Merged

servo-wpt-sync mentioned this pull request Feb 6, 2026

testdriver harness: Allow duration 0 for actions/tick web-platform-tests/wpt#57607

Merged

yezhizhen mentioned this pull request Feb 6, 2026

wpt: Fix syntax error in pointerevent_touch-propagates-when-target-is-video_touch.html #42405

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servo-wpt-sync mentioned this pull request Feb 6, 2026

wpt: Fix syntax error in pointerevent_touch-propagates-when-target-is-video_touch.html web-platform-tests/wpt#57609

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yezhizhen added 2 commits February 9, 2026 00:25

Be consistent with unit

d320a4f

Signed-off-by: Euclid Ye <[email protected]>

Adjust number to match chrome/firefox

e8a84f5

Signed-off-by: Euclid Ye <[email protected]>

yezhizhen force-pushed the pinch-zoom-unit branch from f854a16 to f60e564 Compare February 8, 2026 16:25

servo-wpt-sync mentioned this pull request Feb 8, 2026

paint: Unify scrolling/pinch zoom behaviour across platforms web-platform-tests/wpt#57642

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Add new test

87e485b

Signed-off-by: Euclid Ye <[email protected]>

yezhizhen force-pushed the pinch-zoom-unit branch from f60e564 to 87e485b Compare February 8, 2026 16:37

yezhizhen marked this pull request as ready for review February 8, 2026 16:38

servo-highfive added the S-awaiting-review There is new code that needs to be reviewed. label Feb 8, 2026

yezhizhen added this pull request to the merge queue Feb 9, 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 9, 2026

Merged via the queue into servo:main with commit c5b3913 Feb 9, 2026
33 checks passed

yezhizhen deleted the pinch-zoom-unit branch February 9, 2026 00:54

servo-highfive removed the S-awaiting-merge The PR is in the process of compiling and running tests on the automated CI. label Feb 9, 2026

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paint: Unify scrolling/pinch zoom behaviour across platforms#42387

paint: Unify scrolling/pinch zoom behaviour across platforms#42387
yezhizhen merged 3 commits intoservo:mainfrom
yezhizhen:pinch-zoom-unit

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