[Webkit-unassigned] [Bug 253503] REGRESSION: Top bar is jumpy and glitchy on scmp.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253503

--- Comment #6 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
The page has a “position:fixed” element inside overflow:scroll, but with a transformed ancestor, so the “position:fixed” behaves more like “position:absolute”. But for some reason we don’t reposition it on the scrolling thread correctly.

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