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LibWeb/CSS: Discard unsupported style properties on pseudo-elements

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Quite simply, ignore any declarations for properties we don't want,
while computing a pseudo-element's style.

I've imported a WPT test for this, which fails without this patch.
This commit is contained in:
Sam Atkins 2025-03-20 16:35:02 +00:00
commit 9e65291ebd
Notes: github-actions[bot] 2025-03-24 09:50:54 +00:00
5 changed files with 46 additions and 9 deletions
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22
Tests/LibWeb/Ref/input/wpt-import/css/css-pseudo/placeholder-excluded-properties.html Normal file
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<!DOCTYPE html>
<title>::placeholder should not support 'writing-mode', 'direction', and 'text-orientation'</title>
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#placeholder-pseudo">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#first-line-styling">
<link rel="match" href="../../../../expected/wpt-import/css/css-pseudo/reference/placeholder-excluded-properties-ref.html">
<style>
.horizontal::placeholder {
writing-mode: vertical-rl;
direction: rtl;
}
.vertical {
writing-mode: vertical-rl;
}
.vertical::placeholder {
text-orientation: upright;
}
</style>
<body>
<input class="horizontal" placeholder="placeholder">
<input class="vertical" placeholder="placeholder">
</body>