<!DOCTYPE html>
<meta charset="UTF-8">
<title>position interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-position-3/#position-property">
<meta name="assert" content="position has discrete animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<style>
.parent {
position: relative;
display: inline-block;
height: 10px;
margin: 0px;
}
.target {
width: 10px;
height: 10px;
background-color: black;
left: 10px;
position: 10px;
}
.expected {
background-color: green;
}
</style>
<body>
<template id="target-template">
<div class="parent">
<div class="target"></div>
</div>
</template>
</body>
<script>
// Use default transition-behavior: normal.
test_no_interpolation({
property: 'position',
from: 'absolute',
to: 'static',
});
test_interpolation({
property: 'position',
behavior: 'allow-discrete',
from: 'relative',
to: 'static',
}, [
{at: -1, expect: 'relative'},
{at: 0, expect: 'relative'},
{at: 0.4, expect: 'relative'},
{at: 0.5, expect: 'static'},
{at: 1, expect: 'static'},
{at: 1.5, expect: 'static'},
]);
test_interpolation({
property: 'position',
behavior: 'allow-discrete',
from: 'sticky',
to: 'fixed',
}, [
{at: -1, expect: 'sticky'},
{at: 0, expect: 'sticky'},
{at: 0.4, expect: 'sticky'},
{at: 0.5, expect: 'fixed'},
{at: 1, expect: 'fixed'},
{at: 1.5, expect: 'fixed'},
]);
// This is still discrete interpolation; this test ensures that the neutral
// keyframe is defined correctly for position.
test_interpolation({
property: 'position',
from: neutralKeyframe,
to: 'absolute',
method: 'CSS Animations',
}, [
{at: -1, expect: 'static'},
{at: 0, expect: 'static'},
{at: 0.25, expect: 'static'},
{at: 0.5, expect: 'absolute'},
{at: 0.75, expect: 'absolute'},
{at: 1, expect: 'absolute'},
{at: 2, expect: 'absolute'},
]);
</script>
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