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LibWeb: Cache parsed inline style of DOM elements

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Instead of invoking the CSS parser every time we compute the style for
an element that has a "style" attribute, we now cache the result of
parsing the inline style whenever the "style" attribute is set.

This is a nice boost to relayout performance since we no longer hit the
CSS parser at all.
This commit is contained in:
Andreas Kling 2020-12-07 19:56:53 +01:00
parent 867faa5d44
commit d65bebd8cf
4 changed files with 12 additions and 7 deletions
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9
Libraries/LibWeb/CSS/StyleResolver.cpp
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@ -567,12 +567,9 @@ NonnullRefPtr<StyleProperties> StyleResolver::resolve_style(const DOM::Element&
}
}
auto style_attribute = element.attribute(HTML::AttributeNames::style);
if (!style_attribute.is_null()) {
if (auto declaration = parse_css_declaration(CSS::ParsingContext(document()), style_attribute)) {
for (auto& property : declaration->properties()) {
set_property_expanding_shorthands(style, property.property_id, property.value, m_document);
}
if (auto* inline_style = element.inline_style()) {
for (auto& property : inline_style->properties()) {
set_property_expanding_shorthands(style, property.property_id, property.value, m_document);
}
}