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LibWeb: Clarify stacking context creation for viewport box
Explicitly check is_viewport() instead of looking at the corresponding DOM node. (The viewport has the DOM document as its DOM node, but that's not obvious from context here.)
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@ -117,8 +117,15 @@ bool Node::establishes_stacking_context() const
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if (!has_style())
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return false;
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if (is_root_element() || dom_node() == &document().root())
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// We make a stacking context for the viewport. Painting and hit testing starts from here.
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if (is_viewport())
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return true;
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// Root element of the document (<html>).
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if (is_root_element())
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return true;
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auto position = computed_values().position();
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// Element with a position value absolute or relative and z-index value other than auto.
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