[Webkit-unassigned] [Bug 142783] RenderLayerCompositor: only create backing for visible and non-empty layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142783

--- Comment #13 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
OK, what I see on Mac with that testcase is a bunch of compositing layers, but most of them have no backing store so are cheap.

This is expected behavior; there's no enclosing stacking context, so each position:relative layer gets composited.

Blink wrote some "layer flattening" code to solve this, but it's complex and hard to get right.

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