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LibWeb: Only invalidate shadow root when style sheet inside changes

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We don't have to invalidate style for the entire document when a style
sheet changes inside of a shadow root.

To make this possible, StyleSheetList now keeps track of which
Document-or-ShadowRoot it corresponds to, instead of just tracking the
containing Document.

This avoids a lot of style recomputation on pages with lots of shadow
DOM content (like GitHub).
This commit is contained in:
Andreas Kling 2024-08-20 14:55:28 +02:00 • committed by Andreas Kling
commit 4bc3055c0f
Notes: github-actions[bot] 2024-08-20 14:11:28 +00:00
5 changed files with 37 additions and 25 deletions
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2
Userland/Libraries/LibWeb/DOM/ShadowRoot.cpp
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@ -122,7 +122,7 @@ WebIDL::ExceptionOr<void> ShadowRoot::set_html_unsafe(StringView html)
CSS::StyleSheetList& ShadowRoot::style_sheets()
{
if (!m_style_sheets)
m_style_sheets = CSS::StyleSheetList::create(document());
m_style_sheets = CSS::StyleSheetList::create(*this);
return *m_style_sheets;
}