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<!DOCTYPE html>
<title>CSS Values and Units Test: rch invalidation</title>
<link rel="author" title="Daniil Sakhapov" href="sakhapov@google.com">
<link rel="help" href="https://drafts.csswg.org/css-values/#font-relative-lengths">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name="assert" content="test rch invalidation">
<style>
@import url("/fonts/ahem.css");
html {
font-family: 'Ahem';
font-size: 40px;
}
body {
font-family: monospace;
font-size: 20px;
}
div {
width: 10rch;
}
</style>
<html>
<body>
<div id="div"></div>
</body>
</html>
<script>
setup({ single_test: true });
let old_width = div.getBoundingClientRect().width;
document.documentElement.style.fontFamily = "sans-serif";
let new_width = div.getBoundingClientRect().width;
assert_not_equals(old_width, new_width, "expect the width of zero of Ahem and sans-serif to be different");
done();
</script>
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