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<!DOCTYPE html>
<meta charset="UTF-8">
<title>outline-width composition</title>
<link rel="help" href="https://drafts.csswg.org/css-ui-3/#outline-width">
<meta name="assert" content="outline-width supports animation by computed value">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<body>
<style>
.target {
/* If outline-style is none (the default), the computed style of outline-width is 0. */
outline-style: solid;
}
</style>
<script>
test_composition({
property: 'outline-width',
underlying: '50px',
addFrom: '100px',
addTo: '200px',
}, [
{at: -0.3, expect: '120px'},
{at: 0, expect: '150px'},
{at: 0.5, expect: '200px'},
{at: 1, expect: '250px'},
{at: 1.5, expect: '300px'},
]);
test_composition({
property: 'outline-width',
underlying: '100px',
addFrom: '10px',
addTo: '2px',
}, [
{at: -0.5, expect: '114px'},
{at: 0, expect: '110px'},
{at: 0.5, expect: '106px'},
{at: 1, expect: '102px'},
{at: 1.5, expect: '98px'}, // Value clamping should happen after composition.
]);
test_composition({
property: 'outline-width',
underlying: '10em',
addFrom: '100px',
addTo: '20em',
}, [
{at: -0.3, expect: 'calc(130px + 4em)'},
{at: 0, expect: 'calc(100px + 10em)'},
{at: 0.5, expect: 'calc(50px + 20em)'},
{at: 1, expect: '30em'},
{at: 1.5, expect: 'calc(-50px + 40em)'},
]);
test_composition({
property: 'outline-width',
underlying: '50px',
addFrom: '100px',
replaceTo: '200px',
}, [
{at: -0.3, expect: '135px'},
{at: 0, expect: '150px'},
{at: 0.5, expect: '175px'},
{at: 1, expect: '200px'},
{at: 1.5, expect: '225px'},
]);
test_composition({
property: 'outline-width',
underlying: 'thick', // 5px
addFrom: '11px',
addTo: 'thin', // 1px
}, [
{at: -0.3, expect: '19px'},
{at: 0, expect: '16px'},
{at: 0.5, expect: '11px'},
{at: 1, expect: '6px'},
{at: 1.5, expect: '1px'},
{at: 2, expect: '0px'}, // CSS outline-width can't be negative.
]);
</script>
</body>
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