Mathis Wiehl dd81a975d7 LibWeb: Establish a stacking context for root element ...

Until now we were just creating a stacking context for the tree root,
which usually is the viewport element. This lead to weird painting
behaviour when negative z-index children of the html element that
established their own stacking context were drawn below the canvas
background.

Now we establish a stacking context for both, the root element and the
viewport.

2023-03-11 16:54:58 +00:00

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