Background: According to CSS 2.1 spec, an element becomes a stacking context when: - it is positioned (relative, absolute, or fixed) - and it has a non-auto z-index
Spec also mentions that there's room for expanding this definition; the examples I know about are fixed-position elements and elements with transforms. Questions: The implementation of RenderLayer::isStackingContext() looks fishy. It only checks for a non-auto z-index. It does not check for the positioning style of the layer. There is no indication that it checks for any more recent special cases such as fixed-position or transforms. Is this function name a misnomer? should it actually be renamed to hasNonAutoZIndex() ? If the additional criteria is not being checked inside this helper function, then where is it? I see some code in collectLayers that looks vaguely similar to checking whether an element is positioned, but what about all the other uses of isStackingContext everywhere? Thanks! Shawn
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