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<!DOCTYPE html>
<title>CSS Anchor Positioning: Invalidation when the anchor*() fallback matches old style</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
<link rel="help" href="https://issues.chromium.org/issues/333858786">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#cb {
position: relative;
width: 200px;
height: 200px;
border: 1px solid black;
}
#anchor {
anchor-name: --a;
position: absolute;
width: 40px;
height: 30px;
left: 75px;
top: 75px;
background: coral;
}
#anchored {
position: absolute;
background: seagreen;
width: 50px;
height: 50px;
}
#anchored.change {
/* The fallbacks match what the unchanged style says, but we shouldn't
take the fallbacks here. */
width: anchor-size(--a width, 50px);
height: anchor-size(--a height, 50px);
}
</style>
<div id=cb>
<div id=anchor></div>
<div id=anchored>X</div>
</div>
<script>
test(() => {
assert_equals(anchored.offsetWidth, 50);
assert_equals(anchored.offsetHeight, 50);
anchored.classList.toggle('change');
assert_equals(anchored.offsetWidth, 40);
assert_equals(anchored.offsetHeight, 30);
}, 'Correct invalidation when fallbacks match the old style');
</script>
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