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LibWeb: Establish a stacking context for root element

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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.
This commit is contained in:
Mathis Wiehl 2023-03-11 17:17:17 +01:00 • committed by Linus Groh
parent 08c1effc04
commit dd81a975d7
1 changed files with 1 additions and 1 deletions
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2
Userland/Libraries/LibWeb/Layout/Node.cpp
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@ -117,7 +117,7 @@ bool Node::establishes_stacking_context() const
if (!has_style())
return false;
if (dom_node() == &document().root())
if (is_root_element() || dom_node() == &document().root())
return true;
auto position = computed_values().position();