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b981e6f7bc
Many times, attribute mutation doesn't necessitate a full style invalidation on the element. However, the conditions are pretty elaborate, so this first version has a lot of false positives. We only need to invalidate style when any of these things apply: 1. The change may affect the match state of a selector somewhere. 2. The change may affect presentational hints applied to the element. For (1) in this first version, we have a fixed list of attribute names that may affect selectors. We also collect all names referenced by attribute selectors anywhere in the document. For (2), we add a new Element::is_presentational_hint() virtual that tells us whether a given attribute name is a presentational hint. This drastically reduces style work on many websites. As an example, https://cnn.com/ is once again browseable.
39 lines
1 KiB
C++
39 lines
1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibWeb/ARIA/Roles.h>
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#include <LibWeb/HTML/HTMLElement.h>
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namespace Web::HTML {
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class HTMLHeadingElement final : public HTMLElement {
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WEB_PLATFORM_OBJECT(HTMLHeadingElement, HTMLElement);
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GC_DECLARE_ALLOCATOR(HTMLHeadingElement);
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public:
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virtual ~HTMLHeadingElement() override;
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virtual bool is_presentational_hint(FlyString const&) const override;
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virtual void apply_presentational_hints(GC::Ref<CSS::CascadedProperties>) const override;
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// https://www.w3.org/TR/html-aria/#el-h1-h6
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virtual Optional<ARIA::Role> default_role() const override { return ARIA::Role::heading; }
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virtual Optional<String> aria_level() const override
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{
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// TODO: aria-level = the number in the element's tag name
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return get_attribute("aria-level"_fly_string);
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}
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private:
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HTMLHeadingElement(DOM::Document&, DOM::QualifiedName);
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virtual void initialize(JS::Realm&) override;
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};
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}
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