NEW 281300
passive:false wheel event listener and overscroll-behavior: contain prevent scrolling 
https://bugs.webkit.org/show_bug.cgi?id=281300
Summary passive:false wheel event listener and overscroll-behavior: contain prevent s...
Clément Roche
Reported 2024-10-11 06:17:50 PDT
While using a passive "wheel" event listener "window.addEventListener('wheel',()=>{},{passive:false})" and "overscroll-behavior: contain" on html element, it fully blocks the scrolling. Apparently "overscroll-behavior-y: contain" works using a trackpad but not using a mouse. It seems to happen on all Safari versions, I tested by myself on Safari 17.2.1 and Safari 18.0.1. Here is a minimal reproduction link: https://codepen.io/ClementRoche/pen/WNVRQXG
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Simon Fraser (smfr)
Comment 1 2024-10-11 09:45:05 PDT
`{passive:false}` would be an active listener, not a passive one.
Radar WebKit Bug Importer
Comment 2 2024-10-11 09:45:37 PDT
<rdar://problem/137757208>
Clément Roche
Comment 3 2024-10-11 09:48:41 PDT
You're right, double negation got me, I've edited the title.
Simon Fraser (smfr)
Comment 4 2025-01-07 17:24:26 PST
This is caused by the early return in EventHandler::handleWheelEventInternal(): if (view->shouldBlockScrollPropagation(filteredDelta)) return true;
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