725967 - Always layerize elements transformed by 3d properties, even if the transform is actually 2d

Status: NEW

(Core :: Layout, defect)

Description

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

This matches webkit behavior, which roc says web authors have been trained to expect.

Should even invisible elements be layerized?  I'm not sure what webkit does there.

Comment 1

[Robert O'Callahan (:roc) (email my personal email if necessary)]

I don't think invisible elements should be prerendered, if that's what you mean. We should continue to respect visible regions etc.

Comment 2

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

There are cases when authors might rely on that for perf reasons.  I don't know whether webkit prerenders them or not.  It just depends on how closely we want to match their impl.

Comment 3

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

There's a "workaround" that uses perspective, but AFAIK that doesn't match webkit behavior.

Comment 4

[Chris Jones [:cjones] inactive; ni?/f?/r? if you need me]

I'll claim the workaround gets us competitive parity, but I also think matching webkit's heuristics as leaked to content is an important use case.