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<!DOCTYPE html>
<title>CSS Test: resolve top percentage value against proper box</title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/3115" />
<link rel="help" href="https://drafts.csswg.org/css-position/#sticky-pos" />
<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-values" />
<meta name="assert" content="Test that the sticky percentage insets are
resolved against the right ancestor, i.e. the nearest scrollport." />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div style="height: 500px; background: purple; overflow: hidden;">
<div style="height: 400px; background: yellow;">
<div id="target" style="height: 100px; position: sticky; left: 0; top: 50%; background: blue;">
</div>
</div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target).top, '250px');
}, "Sticky element's top property percentage value should be resolved against the div with overflow: hidden");
</script>
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