Summary: Make wheel / DOMMouseScroll / MozMousePixelScroll event
listeners on the root passive by default.
This effectively aligns with Chromium (see [1]), and with touchstart /
touchmove events.
Bug: 1673278
Standard: None, this is an intervention, though
https://w3c.github.io/uievents/#cancelability-of-wheel-events is loosely
related.
https://github.com/WICG/interventions/issues/64 is the main discussion.
Platform coverage: all
Preference: dom.event.default_to_passive_wheel_listeners
DevTools bug: N/A
Other browsers: Chromium-based browsers ship this since basically
forever. WebKit doesn't implement this, but it does implement a similar
quirk for touch events (as above), and I think implementing this would
allow them to get rid of a nasty hack in their events code too[2]
(interestingly chromium still keeps their smoothscroll.js intervention,
though I think it's just dead code at this point, I filed [3] for that).
web-platform-tests: This is not tested by WPT, as it's an intervention.
If WebKit decides to implement we should probably put this in a spec and
move tests there.
Cheers,
-- Emilio
[1]:
https://developers.google.com/web/updates/2019/02/scrolling-intervention
[2]: https://bugs.webkit.org/show_bug.cgi?id=207040
[3]: https://bugs.chromium.org/p/chromium/issues/detail?id=1142482
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