[Webkit-unassigned] [Bug 233141] "Pinch to tab overview" browser gesture occasionally fires despite preventDefault()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=233141

--- Comment #5 from Sam Sneddon [:gsnedders] <gsnedders at apple.com> ---
>From the dupe:

(In reply to Jarod Gowgiel from comment #0)
> When zooming out on a web page, Safari triggers a "Tab Expose" view as a
> result of overscroll, and when scrolling backwards or forwards triggers
> navigation.
> 
> I'd expect that, similar to other gestures, calling preventDefault() on the
> resulting GestureEnd would prevent these system gestures from occurring, but
> that isn't the case. On iOS, it's a known workaround to preventDefault() on
> the touchstart event that begins the gesture, but similar workarounds (like
> preventDefault() on the mousedown) seem to not have the same effect on macOS
> in Safari from my experimentation.
> 
> As an alternate approach, I also tried out overscroll-behavior. The
> specification for overscroll-behavior (which will be the [new default
> soon](https://bugs.webkit.org/show_bug.cgi?id=236060) and that I
> experimented with activating for myself locally via the "Experimental
> Features") states that "[contain] indicates that the element must not
> perform non-local boundary default actions such as scroll chaining or
> navigation." Even when applying "overscroll-behavior: contain" to an
> element, both of these non-local interactions (swiping backwards, and
> pinching to zoom) are still triggered.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20220804/0ac66708/attachment-0001.htm>