[Webkit-unassigned] [Bug 196508] Async overflow scroll on iOS paints slowly if it has a negative z-index child

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196508

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
We're clipping the foreground layer to the visible area which is wrong.

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