bug218842 changed 'wheel' and 'mousewheel' events on root objects to be passive if they were not explicitly registered as non-passive. Most of the work is done but this feature is hidden under a mac-specific version check enabled only when linking with new versions of the SDK. Considering GTK/WPE release scheme, could it be enabled directly? New tests timing out due to this: fast/events/wheel/wheel-event-listeners-on-body-made-passive.html fast/events/wheel/wheel-event-listeners-on-document-made-passive.html fast/events/wheel/wheel-event-listeners-on-window-left-active.html fast/events/wheel/wheel-event-listeners-on-window-made-passive.html
fast/events/wheel/wheel-event-in-passive-region-non-cancelable.html It's also timing out and related to the bugs previously mentioned.
<rdar://problem/71649886>