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LibWeb: Handle non-numeric font-weight values in keyframes

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Previously, using `font-weight` with a keyword or `calc()` value inside
a keyframe rule would cause a crash.
This commit is contained in:
Tim Ledbetter
2025-06-25 05:55:10 +01:00
committed by Jelle Raaijmakers
parent e69d9fb331
commit 48f56cad08
Notes: github-actions[bot] 2025-06-25 07:03:08 +00:00 
Author: https://github.com/tcl3
Commit: https://github.com/LadybirdBrowser/ladybird/commit/48f56cad088
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5206
Reviewed-by: https://github.com/gmta ✅
3 changed files with 42 additions and 1 deletions
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34
Tests/LibWeb/Text/input/wpt-import/css/css-values/tree-counting/sibling-index-keyframe-font-weight-dynamic.html Normal file
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<!DOCTYPE html>
<title>CSS Values and Units Test: sibling-index() changing font-weight during @keyframes animation</title>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#tree-counting">
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<style>
@keyframes --anim {
from {
font-weight: calc(100 * sibling-index());
}
to {
font-weight: 600;
}
}
#target {
animation: --anim 1000s step-end;
}
</style>
<div>
<div id="rm"></div>
<div></div>
<div id="target"></div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target).fontWeight, "300");
}, "Initially, the sibling-index() is 3 for #target");
test(() => {
rm.remove();
assert_equals(getComputedStyle(target).fontWeight, "200");
}, "Removing a preceding sibling of #target reduces the sibling-index()");
</script>