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layout: Add initial support for the ::marker pseudo-element (#36317)

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This change adds support for the `::marker` pseudo-element and ensure
that
markers are cached into the box tree. This is only initial support,
there are a few
things missing such as animations, transitions, and support the
`content` CSS
property.

Testing: There are WPT tests for this change.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-04-07 19:49:05 +02:00 • committed by GitHub
parent a5c547259f
commit 2b63e60e8f
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27 changed files with 282 additions and 276 deletions
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4
components/layout_2020/dom_traversal.rs
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@ -236,6 +236,10 @@ fn traverse_element<'dom, Node>(
) where
Node: NodeExt<'dom>,
{
// Clear any existing pseudo-element box slot, because markers are not handled like
// `::before`` and `::after`. They are processed during box tree creation.
element.unset_pseudo_element_box(PseudoElement::Marker);
let replaced = ReplacedContents::for_element(element, context);
let style = element.style(context);
match Display::from(style.get_box().display) {