Remove non-standard `overflowchanged` #50833

Ahmad-S792 · 2025-09-17T00:13:42Z

`55f58b7`

Remove non-standard `overflowchanged`
https://bugs.webkit.org/show_bug.cgi?id=218402
rdar://71129110

Reviewed by Simon Fraser.

This landed in past 281672@main but got reverted on assumption of causing
regression on webmail.biglobe.ne.jp in 289380@main but it seems the website
claims on blog news post that it is still broken in iOS 26 [1]. So this was
not cause of regression, so this is second attempt to land this.

[1] https://support.biglobe.ne.jp/news/news752.html (Use Translation)

This patch aligns WebKit with Gecko / Firefox, Blink / Chromium by
removing non-standard `overflowchanged`.

It was removed from Blink in 2015 [2]:

[2] chromium/chromium@86665f6

It was never supported by Gecko / Firefox.

* Source/WebCore/CMakeLists.txt:
* Source/WebCore/DerivedSources-input.xcfilelist:
* Source/WebCore/DerivedSources-output.xcfilelist:
* Source/WebCore/DerivedSources.make:
* Source/WebCore/Headers.cmake:
* Source/WebCore/Sources.txt:
* Source/WebCore/WebCore.xcodeproj/project.pbxproj:
* Source/WebCore/dom/Document.cpp:
(WebCore::Document::createEvent):
(WebCore::Document::addListenerTypeIfNeeded):
(WebCore::Document::enqueueOverflowEvent): Deleted.
* Source/WebCore/dom/Document.h:
* Source/WebCore/dom/EventInterfaces.in:
* Source/WebCore/dom/EventNames.json:
* Source/WebCore/dom/OverflowEvent.cpp: Removed.
* Source/WebCore/dom/OverflowEvent.h: Removed.
* Source/WebCore/dom/OverflowEvent.idl: Removed.
* Source/WebCore/page/LocalFrameView.cpp:
(WebCore::LocalFrameView::didLayout):
(WebCore::LocalFrameView::updateOverflowStatus): Deleted.
* Source/WebCore/page/LocalFrameView.h:
* Source/WebCore/rendering/RenderBlock.cpp:
(WebCore::RenderBlock::layout):
(WebCore::OverflowEventDispatcher::OverflowEventDispatcher): Deleted.
(WebCore::OverflowEventDispatcher::~OverflowEventDispatcher): Deleted.
* Source/WebCore/rendering/RenderLayer.cpp:
* Source/WebKitLegacy/mac/DOM/DOMEvents.mm:
(kitClass):
* Source/WebKitLegacy/mac/DOM/DOMOverflowEvent.mm:
(-[DOMOverflowEvent orient]):
(-[DOMOverflowEvent horizontalOverflow]):
(-[DOMOverflowEvent verticalOverflow]):
(-[DOMOverflowEvent initOverflowEvent:horizontalOverflow:verticalOverflow:]):

> Test Updates / Removals:
* LayoutTests/fast/dom/Window/resources/window-properties.js:
* LayoutTests/fast/dom/Window/window-lookup-precedence-expected.txt:
* LayoutTests/fast/dom/wrapper-classes-expected.txt:
* LayoutTests/fast/dom/wrapper-classes.html:
* LayoutTests/fast/dynamic/paused-event-dispatch-expected.txt: Removed.
* LayoutTests/fast/dynamic/paused-event-dispatch.html: Removed.
* LayoutTests/fast/dynamic/resources/paused-event-dispatch-iframe.html: Removed.
* LayoutTests/fast/events/change-overflow-on-overflow-change-expected.txt: Removed.
* LayoutTests/fast/events/change-overflow-on-overflow-change.html: Removed.
* LayoutTests/fast/events/constructors/overflow-event-constructor-expected.txt: Removed.
* LayoutTests/fast/events/constructors/overflow-event-constructor.html: Removed.
* LayoutTests/fast/events/event-creation-expected.txt:
* LayoutTests/fast/events/event-creation.html:
* LayoutTests/fast/events/overflow-events-expected.txt: Removed.
* LayoutTests/fast/events/overflow-events-writing-mode-expected.txt: Removed.
* LayoutTests/fast/events/overflow-events-writing-mode.html: Removed.
* LayoutTests/fast/events/overflow-events.html: Removed.
* LayoutTests/fast/events/overflow-viewport-renderer-deleted.html: Removed.
* LayoutTests/fast/events/overflowchanged-inside-selection-collapse-crash-expected.txt: Removed.
* LayoutTests/fast/events/overflowchanged-inside-selection-collapse-crash.html: Removed.
* LayoutTests/fast/overflow/horizontal-overflow-with-offset-expected.txt: Removed.
* LayoutTests/fast/overflow/horizontal-overflow-with-offset.html: Removed.
* LayoutTests/fast/overflow/vertical-overflow-with-offset-expected.txt: Removed.
* LayoutTests/fast/overflow/vertical-overflow-with-offset.html: Removed.
* LayoutTests/js/dom/constructor-length.html:
* LayoutTests/platform/glib/fast/dom/Window/window-lookup-precedence-expected.txt:
* LayoutTests/platform/glib/js/dom/constructor-length-expected.txt:
* LayoutTests/platform/ios/TestExpectations:
* LayoutTests/platform/ios/js/dom/constructor-length-expected.txt:
* LayoutTests/platform/mac-wk2/fast/dom/Window/window-lookup-precedence-expected.txt:
* LayoutTests/platform/mac/fast/dom/wrapper-classes-objc-expected.txt:
* LayoutTests/platform/mac/fast/dom/wrapper-classes-objc.html:
* LayoutTests/platform/mac/js/dom/constructor-length-expected.txt:
* LayoutTests/platform/win/js/dom/constructor-length-expected.txt:

> SafeCPP Expectation Updates:
* Source/WebKitLegacy/SaferCPPExpectations/UncountedCallArgsCheckerExpectations:
* Source/WebKitLegacy/SaferCPPExpectations/MemoryUnsafeCastCheckerExpectations:

Canonical link: https://commits.webkit.org/300125@main

5202e89

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	✅ 🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	~~🧪 win-tests~~	✅ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		✅ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		❌ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

webkit-early-warning-system · 2025-09-17T00:14:51Z

EWS run on previous version of this PR (hash 7e281dd)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	❌ 🛠 ios	❌ 🛠 mac	✅ 🛠 wpe	~~🛠 win~~	❌ 🛠 ios-apple
✅ 🧪 bindings	~~🛠 ios-sim~~	❌ 🛠 mac-AS-debug	~~🧪 wpe-wk2~~	~~🧪 win-tests~~	❌ 🛠 mac-apple
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	❌ 🧪 api-mac	✅ 🧪 api-wpe		❌ 🛠 vision-apple
	~~🧪 ios-wk2-wpt~~	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
~~🛠 🧪 jsc~~	~~🧪 api-ios~~	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	~~🛠 vision~~	~~🧪 mac-AS-debug-wk2~~	~~🧪 gtk-wk2~~
	❌ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	~~🧪 api-gtk~~
	⏳ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	~~🛠 playstation~~
	❌ 🛠 tv	~~🛠 mac-safer-cpp~~	✅ 🛠 jsc-armv7
	~~🛠 tv-sim~~		❌ 🧪 jsc-armv7-tests
	❌ 🛠 watch
	~~🛠 watch-sim~~

webkit-early-warning-system · 2025-09-17T01:10:40Z

EWS run on previous version of this PR (hash c123980)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	~~🛠 wpe~~	~~🛠 win~~	⏳ 🛠 ios-apple
~~🧪 bindings~~	~~🛠 ios-sim~~	✅ 🛠 mac-AS-debug	~~🧪 wpe-wk2~~	~~🧪 win-tests~~	⏳ 🛠 mac-apple
~~🧪 webkitperl~~	~~🧪 ios-wk2~~	⏳ 🧪 api-mac	~~🧪 api-wpe~~		⏳ 🛠 vision-apple
	~~🧪 ios-wk2-wpt~~	~~🧪 mac-wk1~~	~~🛠 wpe-cairo~~
~~🛠 🧪 jsc~~	~~🧪 api-ios~~	~~🧪 mac-wk2~~	~~🛠 gtk~~
~~🛠 🧪 jsc-arm64~~	~~🛠 vision~~	~~🧪 mac-AS-debug-wk2~~	~~🧪 gtk-wk2~~
	~~🛠 vision-sim~~	~~🧪 mac-wk2-stress~~	~~🧪 api-gtk~~
	⏳ 🧪 vision-wk2	~~🧪 mac-intel-wk2~~	~~🛠 playstation~~
	✅ 🛠 tv	~~🛠 mac-safer-cpp~~	✅ 🛠 jsc-armv7
	~~🛠 tv-sim~~		~~🧪 jsc-armv7-tests~~
	~~🛠 watch~~
	~~🛠 watch-sim~~

webkit-early-warning-system · 2025-09-17T01:11:49Z

EWS run on previous version of this PR (hash ef60dc7)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	~~🛠 wpe~~	~~🛠 win~~	⏳ 🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	~~🧪 wpe-wk2~~	~~🧪 win-tests~~	⏳ 🛠 mac-apple
✅ 🧪 webkitperl	~~🧪 ios-wk2~~	⏳ 🧪 api-mac	~~🧪 api-wpe~~		⏳ 🛠 vision-apple
	~~🧪 ios-wk2-wpt~~	~~🧪 mac-wk1~~	~~🛠 wpe-cairo~~
~~🛠 🧪 jsc~~	~~🧪 api-ios~~	~~🧪 mac-wk2~~	~~🛠 gtk~~
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	~~🧪 mac-AS-debug-wk2~~	~~🧪 gtk-wk2~~
	~~🛠 vision-sim~~	~~🧪 mac-wk2-stress~~	~~🧪 api-gtk~~
	⏳ 🧪 vision-wk2	~~🧪 mac-intel-wk2~~	~~🛠 playstation~~
	~~🛠 tv~~	~~🛠 mac-safer-cpp~~	✅ 🛠 jsc-armv7
	~~🛠 tv-sim~~		~~🧪 jsc-armv7-tests~~
	✅ 🛠 watch
	~~🛠 watch-sim~~

webkit-early-warning-system · 2025-09-17T01:15:42Z

EWS run on previous version of this PR (hash 8648c4d)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	❌ 🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests	✅ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		✅ 🛠 vision-apple
	⏳ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	⏳ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		❌ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

webkit-ews-buildbot · 2025-09-17T03:05:59Z

Safer C++ Build #53737 (`8648c4d`)

⚠️ Found 1 fixed file! Please update expectations in Source/[Project]/SaferCPPExpectations by running the following command and update your pull request:

Tools/Scripts/update-safer-cpp-expectations -p WebKitLegacy --MemoryUnsafeCastChecker mac/DOM/DOMOverflowEvent.mm --UncountedCallArgsChecker mac/DOM/DOMOverflowEvent.mm

webkit-early-warning-system · 2025-09-17T18:44:59Z

EWS run on current version of this PR (hash 5202e89)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	✅ 🛠 ios-apple
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	~~🧪 win-tests~~	✅ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		✅ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
✅ 🛠 🧪 jsc	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
✅ 🛠 🧪 jsc-arm64	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	✅ 🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp	✅ 🛠 jsc-armv7
	✅ 🛠 tv-sim		❌ 🧪 jsc-armv7-tests
	✅ 🛠 watch
	✅ 🛠 watch-sim

https://bugs.webkit.org/show_bug.cgi?id=218402 rdar://71129110 Reviewed by Simon Fraser. This landed in past 281672@main but got reverted on assumption of causing regression on webmail.biglobe.ne.jp in 289380@main but it seems the website claims on blog news post that it is still broken in iOS 26 [1]. So this was not cause of regression, so this is second attempt to land this. [1] https://support.biglobe.ne.jp/news/news752.html (Use Translation) This patch aligns WebKit with Gecko / Firefox, Blink / Chromium by removing non-standard `overflowchanged`. It was removed from Blink in 2015 [2]: [2] chromium/chromium@86665f6 It was never supported by Gecko / Firefox. * Source/WebCore/CMakeLists.txt: * Source/WebCore/DerivedSources-input.xcfilelist: * Source/WebCore/DerivedSources-output.xcfilelist: * Source/WebCore/DerivedSources.make: * Source/WebCore/Headers.cmake: * Source/WebCore/Sources.txt: * Source/WebCore/WebCore.xcodeproj/project.pbxproj: * Source/WebCore/dom/Document.cpp: (WebCore::Document::createEvent): (WebCore::Document::addListenerTypeIfNeeded): (WebCore::Document::enqueueOverflowEvent): Deleted. * Source/WebCore/dom/Document.h: * Source/WebCore/dom/EventInterfaces.in: * Source/WebCore/dom/EventNames.json: * Source/WebCore/dom/OverflowEvent.cpp: Removed. * Source/WebCore/dom/OverflowEvent.h: Removed. * Source/WebCore/dom/OverflowEvent.idl: Removed. * Source/WebCore/page/LocalFrameView.cpp: (WebCore::LocalFrameView::didLayout): (WebCore::LocalFrameView::updateOverflowStatus): Deleted. * Source/WebCore/page/LocalFrameView.h: * Source/WebCore/rendering/RenderBlock.cpp: (WebCore::RenderBlock::layout): (WebCore::OverflowEventDispatcher::OverflowEventDispatcher): Deleted. (WebCore::OverflowEventDispatcher::~OverflowEventDispatcher): Deleted. * Source/WebCore/rendering/RenderLayer.cpp: * Source/WebKitLegacy/mac/DOM/DOMEvents.mm: (kitClass): * Source/WebKitLegacy/mac/DOM/DOMOverflowEvent.mm: (-[DOMOverflowEvent orient]): (-[DOMOverflowEvent horizontalOverflow]): (-[DOMOverflowEvent verticalOverflow]): (-[DOMOverflowEvent initOverflowEvent:horizontalOverflow:verticalOverflow:]): > Test Updates / Removals: * LayoutTests/fast/dom/Window/resources/window-properties.js: * LayoutTests/fast/dom/Window/window-lookup-precedence-expected.txt: * LayoutTests/fast/dom/wrapper-classes-expected.txt: * LayoutTests/fast/dom/wrapper-classes.html: * LayoutTests/fast/dynamic/paused-event-dispatch-expected.txt: Removed. * LayoutTests/fast/dynamic/paused-event-dispatch.html: Removed. * LayoutTests/fast/dynamic/resources/paused-event-dispatch-iframe.html: Removed. * LayoutTests/fast/events/change-overflow-on-overflow-change-expected.txt: Removed. * LayoutTests/fast/events/change-overflow-on-overflow-change.html: Removed. * LayoutTests/fast/events/constructors/overflow-event-constructor-expected.txt: Removed. * LayoutTests/fast/events/constructors/overflow-event-constructor.html: Removed. * LayoutTests/fast/events/event-creation-expected.txt: * LayoutTests/fast/events/event-creation.html: * LayoutTests/fast/events/overflow-events-expected.txt: Removed. * LayoutTests/fast/events/overflow-events-writing-mode-expected.txt: Removed. * LayoutTests/fast/events/overflow-events-writing-mode.html: Removed. * LayoutTests/fast/events/overflow-events.html: Removed. * LayoutTests/fast/events/overflow-viewport-renderer-deleted.html: Removed. * LayoutTests/fast/events/overflowchanged-inside-selection-collapse-crash-expected.txt: Removed. * LayoutTests/fast/events/overflowchanged-inside-selection-collapse-crash.html: Removed. * LayoutTests/fast/overflow/horizontal-overflow-with-offset-expected.txt: Removed. * LayoutTests/fast/overflow/horizontal-overflow-with-offset.html: Removed. * LayoutTests/fast/overflow/vertical-overflow-with-offset-expected.txt: Removed. * LayoutTests/fast/overflow/vertical-overflow-with-offset.html: Removed. * LayoutTests/js/dom/constructor-length.html: * LayoutTests/platform/glib/fast/dom/Window/window-lookup-precedence-expected.txt: * LayoutTests/platform/glib/js/dom/constructor-length-expected.txt: * LayoutTests/platform/ios/TestExpectations: * LayoutTests/platform/ios/js/dom/constructor-length-expected.txt: * LayoutTests/platform/mac-wk2/fast/dom/Window/window-lookup-precedence-expected.txt: * LayoutTests/platform/mac/fast/dom/wrapper-classes-objc-expected.txt: * LayoutTests/platform/mac/fast/dom/wrapper-classes-objc.html: * LayoutTests/platform/mac/js/dom/constructor-length-expected.txt: * LayoutTests/platform/win/js/dom/constructor-length-expected.txt: > SafeCPP Expectation Updates: * Source/WebKitLegacy/SaferCPPExpectations/UncountedCallArgsCheckerExpectations: * Source/WebKitLegacy/SaferCPPExpectations/MemoryUnsafeCastCheckerExpectations: Canonical link: https://commits.webkit.org/300125@main

webkit-commit-queue · 2025-09-18T00:41:14Z

Committed 300125@main (55f58b7): https://commits.webkit.org/300125@main

Reviewed commits have been landed. Closing PR #50833 and removing active labels.

Ahmad-S792 requested review from a team, cdumez and rniwa as code owners September 17, 2025 00:13

Ahmad-S792 self-assigned this Sep 17, 2025

Ahmad-S792 added the DOM For bugs specific to XML/HTML DOM elements (including parsing). label Sep 17, 2025

Ahmad-S792 marked this pull request as draft September 17, 2025 00:19

Ahmad-S792 changed the title ~~Remove non-standard overflowchanged~~ Remove non-standard overflowchanged https://bugs.webkit.org/show_bug.cgi?id=218402 rdar://71129110 Sep 17, 2025

Ahmad-S792 force-pushed the eng/Remove-support-for-the-non-standard-overflow-event branch from 7e281dd to c123980 Compare September 17, 2025 01:10

Ahmad-S792 force-pushed the eng/Remove-support-for-the-non-standard-overflow-event branch from c123980 to ef60dc7 Compare September 17, 2025 01:11

Ahmad-S792 changed the title ~~Remove non-standard overflowchanged https://bugs.webkit.org/show_bug.cgi?id=218402 rdar://71129110~~ Remove non-standard overflowchanged Sep 17, 2025

Ahmad-S792 force-pushed the eng/Remove-support-for-the-non-standard-overflow-event branch from ef60dc7 to 8648c4d Compare September 17, 2025 01:15

Ahmad-S792 force-pushed the eng/Remove-support-for-the-non-standard-overflow-event branch from 8648c4d to 5202e89 Compare September 17, 2025 18:44

Ahmad-S792 marked this pull request as ready for review September 18, 2025 00:09

Ahmad-S792 requested a review from smfr September 18, 2025 00:09

smfr approved these changes Sep 18, 2025

View reviewed changes

Ahmad-S792 added the merge-queue Applied to send a pull request to merge-queue label Sep 18, 2025

webkit-commit-queue force-pushed the eng/Remove-support-for-the-non-standard-overflow-event branch from 5202e89 to 55f58b7 Compare September 18, 2025 00:41

webkit-commit-queue merged commit 55f58b7 into WebKit:main Sep 18, 2025

webkit-commit-queue removed the merge-queue Applied to send a pull request to merge-queue label Sep 18, 2025

Ahmad-S792 deleted the eng/Remove-support-for-the-non-standard-overflow-event branch September 18, 2025 00:59

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