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Reuse StylesheetContent for inline style sheets with identical content (#38540)

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For duplicate style sheets with identical content, `StylesheetContents`
can be reused to avoid redundant parsing of the inline style sheets.
Since duplicate stylesheets is a common case with web components, this
change will significantly improve performance. Additionally, the cache
hit rate of stylo's `CascadeDataCache` can now be significantly
improved.

When shared `StylesheetContents` is modified, copy-on-write will occur
to avoid affecting other sharers. And then updates the references to
`CssRule` or `PropertyDeclarationBlock` stored in the CSSOMs to ensure
that modifications are made only on the new copy.

Signed-off-by: sharpshooter_pt <ibluegalaxy_taoj@163.com>
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JoeDow 2025-08-20 20:31:49 +08:00 • committed by GitHub
parent f6b77f94e2
commit 6e6ef513a9
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25 changed files with 711 additions and 125 deletions
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components/script/dom/shadowroot.rs
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@ -242,7 +242,7 @@ impl ShadowRoot {
debug_assert!(cssom_stylesheet.is_constructed());
let stylesheets = &mut self.author_styles.borrow_mut().stylesheets;
let sheet = cssom_stylesheet.style_stylesheet_arc().clone();
let sheet = cssom_stylesheet.style_stylesheet().clone();
let insertion_point = stylesheets.iter().last().cloned();