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font-stretch-interpolation-math-functions.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>font-size-adjust interpolation with css math functions</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-5/#font-size-adjust-prop">
<link rel="help" href="https://drafts.csswg.org/css-values/#sign-funcs">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
</head>
<style>
:root {
font-size: 10px;
}
</style>
<body>
<script>
test_interpolation({
property: 'font-stretch',
from: '100%',
to: 'calc(sign(20rem - 20px) * 180%)',
}, [
{at: -1, expect: '20%'},
{at: 0, expect: '100%'},
{at: 0.125, expect: '110%'},
{at: 0.875, expect: '170%'},
{at: 1, expect: '180%'},
{at: 2, expect: '260%'}
]);
test_interpolation({
property: 'font-stretch',
from: 'calc(sign(20rem - 20px) * 100%)',
to: 'calc(sign(20rem - 20px) * 180%)',
}, [
{at: -1, expect: '20%'},
{at: 0, expect: '100%'},
{at: 0.125, expect: '110%'},
{at: 0.875, expect: '170%'},
{at: 1, expect: '180%'},
{at: 2, expect: '260%'}
]);
</script>
</body>
</html>