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<!DOCTYPE html>
<meta charset="utf-8">
<title> perspective composition</title>
<link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-perspective">
<meta name="assert" content="perspective supports animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<body>
<script>
test_composition({
property: 'perspective',
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: 'perspective',
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: 'perspective',
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: 'perspective',
underlying: '100px',
addFrom: '100px',
addTo: 'none',
}, [
{at: -0.3, expect: '200px'},
{at: 0, expect: '200px'},
{at: 0.5, expect: 'none'},
{at: 1, expect: 'none'},
{at: 1.5, expect: 'none'},
]);
</script>
</body>
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