Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 9a30ed656c7f83a1af1139542cc828e41fcb7d32
https://github.com/WebKit/WebKit/commit/9a30ed656c7f83a1af1139542cc828e41fcb7d32
Author: Joanne Pan <[email protected]>
Date: 2026-04-02 (Thu, 02 Apr 2026)
Changed paths:
A
LayoutTests/pointerevents/ios/pointerdown-prevent-default-prevents-page-scrolling-expected.txt
A
LayoutTests/pointerevents/ios/pointerdown-prevent-default-prevents-page-scrolling.html
A
LayoutTests/pointerevents/ios/pointerdown-without-prevent-default-allows-page-scrolling-expected.txt
A
LayoutTests/pointerevents/ios/pointerdown-without-prevent-default-allows-page-scrolling.html
M Source/WebCore/page/PointerCaptureController.cpp
M Source/WebCore/page/PointerCaptureController.h
M Source/WebKit/UIProcess/WebPageProxy.cpp
M Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm
M Source/WebKit/WebProcess/WebPage/WebPage.cpp
Log Message:
-----------
netflix.com: Webpage scrolls when adjusting volume (VisionOS and iPad)
https://bugs.webkit.org/show_bug.cgi?id=311217
rdar://173808616
Reviewed by Brent Fulgham.
The problem: Netflix's volume slider calls preventDefault() on pointerdown
to stop the page from scrolling while dragging on the slider, but it was
ignored by WebKit. React has passive touch listeners, so WebKit classifies
it as TrackingType::Asynchronous, which routes the event to
sendUnpreventableTouchEvent
instead of sendPreventableTouchEvent.
The fix: The unpreventable path's async reply was discarding the handled result
from the web process. Now when handled=true, it propagates the result back to
the UI process where the scrolling is blocked by panning prevention flags.
Tests:
pointerevents/ios/pointerdown-prevent-default-prevents-page-scrolling.html
pointerevents/ios/pointerdown-without-prevent-default-allows-page-scrolling.html
*
LayoutTests/pointerevents/ios/pointerdown-prevent-default-prevents-page-scrolling-expected.txt:
Added.
*
LayoutTests/pointerevents/ios/pointerdown-prevent-default-prevents-page-scrolling.html:
Added.
*
LayoutTests/pointerevents/ios/pointerdown-without-prevent-default-allows-page-scrolling-expected.txt:
Added.
*
LayoutTests/pointerevents/ios/pointerdown-without-prevent-default-allows-page-scrolling.html:
Added.
* Source/WebCore/page/PointerCaptureController.cpp:
(WebCore::PointerCaptureController::pointerEventWasDispatched):
* Source/WebCore/page/PointerCaptureController.h:
(WebCore::PointerCaptureController::resetPointerDownDefaultPrevention):
(WebCore::PointerCaptureController::wasPointerDownDefaultPrevented const):
* Source/WebKit/UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::sendUnpreventableTouchEvent):
* Source/WebKit/UIProcess/ios/WKContentViewInteraction.mm:
(-[WKContentView _touchEvent:preventsNativeGestures:]):
* Source/WebKit/WebProcess/WebPage/WebPage.cpp:
(WebKit::handleTouchEvent):
Canonical link: https://commits.webkit.org/310491@main
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