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LibWeb: Don't compute full style for ::before/::after unless matched
Before this patch, we would build full computed style for these pseudo elements, for every DOM element, even if no ::before/::after selector actually matched. This was a colossal waste of time, and we can also just not do that. Instead, just abort pseudo element style resolution early if no relevant selectors matched. :^)
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3 changed files with 36 additions and 5 deletions
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@ -154,7 +154,10 @@ ErrorOr<void> TreeBuilder::create_pseudo_element_if_needed(DOM::Element& element
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auto& document = element.document();
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auto& style_computer = document.style_computer();
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auto pseudo_element_style = TRY(style_computer.compute_style(element, pseudo_element));
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auto pseudo_element_style = TRY(style_computer.compute_pseudo_element_style_if_needed(element, pseudo_element));
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if (!pseudo_element_style)
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return {};
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auto pseudo_element_content = pseudo_element_style->content();
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auto pseudo_element_display = pseudo_element_style->display();
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// ::before and ::after only exist if they have content. `content: normal` computes to `none` for them.
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@ -164,7 +167,7 @@ ErrorOr<void> TreeBuilder::create_pseudo_element_if_needed(DOM::Element& element
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|| pseudo_element_content.type == CSS::ContentData::Type::None)
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return {};
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auto pseudo_element_node = DOM::Element::create_layout_node_for_display_type(document, pseudo_element_display, pseudo_element_style, nullptr);
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auto pseudo_element_node = DOM::Element::create_layout_node_for_display_type(document, pseudo_element_display, *pseudo_element_style, nullptr);
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if (!pseudo_element_node)
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return {};
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