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layout: Make absolutely-positioned elements with z-index: auto not

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stacking contexts.

Improves many sites.

Closes #7069.
This commit is contained in:
Patrick Walton 2015-08-10 12:26:03 -07:00
parent 84c4a26e4d
commit d3d59ced36
26 changed files with 58 additions and 80 deletions
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23
components/layout/display_list_builder.rs
View file

@ -1631,15 +1631,28 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
Some(outer_display_list_for_overflow_scroll)
}
_ => {
self.build_display_list_for_block_base(
&mut *display_list,
layout_context,
border_painting_mode,
BackgroundAndBorderLevel::RootOfStackingContext);
let establishes_stacking_context = self.fragment.establishes_stacking_context();
let background_and_border_level = if establishes_stacking_context {
BackgroundAndBorderLevel::RootOfStackingContext
} else {
BackgroundAndBorderLevel::Block
};
self.build_display_list_for_block_base(&mut *display_list,
layout_context,
border_painting_mode,
background_and_border_level);
None
}
};
if !self.fragment.establishes_stacking_context() {
display_list.form_pseudo_stacking_context_for_positioned_content();
self.base.display_list_building_result =
DisplayListBuildingResult::Normal(display_list);
return
}
if !self.will_get_layer() {
// We didn't need a layer.
self.base.display_list_building_result =