Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 4771a54c1936e9729dc7a20fca5c27894698347c
https://github.com/WebKit/WebKit/commit/4771a54c1936e9729dc7a20fca5c27894698347c
Author: Pascoe <[email protected]>
Date: 2026-04-24 (Fri, 24 Apr 2026)
Changed paths:
A LayoutTests/fullscreen/fullscreen-clears-hover-on-overlay-expected.txt
A LayoutTests/fullscreen/fullscreen-clears-hover-on-overlay.html
M Source/WebCore/dom/DocumentFullscreen.cpp
M Source/WebCore/page/EventHandler.cpp
M Source/WebCore/page/EventHandler.h
Log Message:
-----------
Dispatch mouse boundary events when entering fullscreen
https://bugs.webkit.org/show_bug.cgi?id=309586
rdar://157694866
Reviewed by Aditya Keerthi.
After entering fullscreen, Chrome and Firefox dispatch pointer/mouse
boundary events for elements that were under the cursor. Safari does not,
causing JS-driven hover state to stick when sites use pointerenter/
pointerleave on a full-coverage overlay (position:absolute inset:0) to
manage hover styling — after fullscreen the overlay fills the screen, the
cursor stays inside it, and pointerleave never fires. Reduced test case
is attached to the radar.
scheduleMouseEventTargetUpdateAfterLayout does not help here: it
re-hit-tests and only fires events when the target element changes, but
the overlay is still under the cursor after fullscreen.
Add dispatchMouseBoundaryEventsAfterFullscreenChange() which dispatches
mouseout to a null target in didEnterFullscreen(), walking the ancestor
chain to fire mouseleave/pointerleave on every element. Clear the saved
mouse position so timer-based updates don't re-establish stale hover.
Not specified — the Fullscreen spec says nothing about hover or boundary
events. This aligns with Chrome and Firefox behavior.
I have verified the layout test fails without the fix, and passes with it.
* Source/WebCore/dom/DocumentFullscreen.cpp:
(WebCore::DocumentFullscreen::didEnterFullscreen):
* Source/WebCore/page/EventHandler.cpp:
(WebCore::EventHandler::dispatchMouseBoundaryEventsAfterFullscreenChange):
* Source/WebCore/page/EventHandler.h:
* LayoutTests/fullscreen/fullscreen-clears-hover-on-overlay-expected.txt:
* LayoutTests/fullscreen/fullscreen-clears-hover-on-overlay.html:
Canonical link: https://commits.webkit.org/311986@main
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