[Webkit-unassigned] [Bug 216701] WebKit incorrectly composites hundreds of elements when using position: relative

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216701

--- Comment #3 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
The relative-positioned elements end up in layers because the scroller is not a CSS stacking context, so conceptually the relative elements render as siblings (not descendants). There's an optimization to avoid this (layer backing sharing) but the transformed element defeats it.

If you test with the transformed element in the middle of the list you should see no layers for relative elements that come before it.

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