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<!DOCTYPE html>
<meta charset="UTF-8">
<title>z-index interpolation</title>
<link rel="help" href="https://www.w3.org/TR/CSS2/visuren.html#z-index">
<meta name="assert" content="z-index supports animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<style>
body {
margin-top: 20px;
}
.layer-reference {
position: fixed;
top: 0px;
height: 100vh;
width: 50px;
background-color: rgba(255, 255, 255, 0.75);
font-family: sans-serif;
text-align: center;
padding-top: 5px;
border: 1px solid;
}
.parent {
z-index: 15;
}
.target {
position: relative;
width: 350px;
height: 10px;
z-index: -2;
}
.actual {
background-color: black;
}
.expected {
background-color: green;
}
</style>
<body></body>
<script>
test_interpolation({
property: 'z-index',
from: neutralKeyframe,
to: '5',
}, [
{at: -0.3, expect: '-4'},
{at: 0, expect: '-2'},
{at: 0.3, expect: '0'},
{at: 0.6, expect: '2'},
{at: 1, expect: '5'},
{at: 1.5, expect: '9'},
]);
test_no_interpolation({
property: 'z-index',
from: 'initial',
to: '5',
});
// We fail to inherit correctly due to style overadjustment: crbug.com/375982
test_interpolation({
property: 'z-index',
from: 'inherit',
to: '5',
}, [
{at: -0.3, expect: '18'},
{at: 0, expect: '15'},
{at: 0.3, expect: '12'},
{at: 0.6, expect: '9'},
{at: 1, expect: '5'},
{at: 1.5, expect: '0'},
]);
test_no_interpolation({
property: 'z-index',
from: 'unset',
to: '5',
});
test_interpolation({
property: 'z-index',
from: '-5',
to: '5'
}, [
{at: -0.3, expect: '-8'},
{at: 0, expect: '-5'},
{at: 0.3, expect: '-2'},
{at: 0.6, expect: '1'},
{at: 1, expect: '5'},
{at: 1.5, expect: '10'},
]);
test_interpolation({
property: 'z-index',
from: '2',
to: '4'
}, [
{at: -0.3, expect: '1'},
{at: 0, expect: '2'},
{at: 0.3, expect: '3'},
{at: 0.6, expect: '3'},
{at: 1, expect: '4'},
{at: 1.5, expect: '5'},
]);
test_interpolation({
property: 'z-index',
from: '-2',
to: '-4'
}, [
{at: -0.3, expect: '-1'},
{at: 0, expect: '-2'},
{at: 0.1, expect: '-2'},
{at: 0.3, expect: '-3'},
{at: 0.6, expect: '-3'},
{at: 1, expect: '-4'},
{at: 1.5, expect: '-5'},
]);
test_no_interpolation({
property: 'z-index',
from: 'auto',
to: '10',
});
</script>
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