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<!DOCTYPE html>
<meta charset="UTF-8">
<title>opacity interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-color-3/#opacity">
<meta name="assert" content="opacity supports animation">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<style>
.parent {
opacity: 0.8;
}
.target {
width: 100px;
height: 100px;
background-color: black;
display: inline-block;
opacity: 0.1;
}
.expected {
background-color: green;
}
</style>
<body>
<script>
test_interpolation({
property: 'opacity',
from: neutralKeyframe,
to: '0.2',
}, [
{at: -0.3, expect: '0.07'},
{at: 0, expect: '0.1'},
{at: 0.3, expect: '0.13'},
{at: 0.6, expect: '0.16'},
{at: 1, expect: '0.2'},
{at: 1.5, expect: '0.25'},
]);
test_interpolation({
property: 'opacity',
from: 'initial',
to: '0.2',
}, [
{at: -0.3, expect: '1'},
{at: 0, expect: '1'},
{at: 0.3, expect: '0.76'},
{at: 0.6, expect: '0.52'},
{at: 1, expect: '0.2'},
{at: 1.5, expect: '0'},
]);
test_interpolation({
property: 'opacity',
from: 'inherit',
to: '0.2',
}, [
{at: -0.3, expect: '0.98'},
{at: 0, expect: '0.8'},
{at: 0.3, expect: '0.62'},
{at: 0.6, expect: '0.44'},
{at: 1, expect: '0.2'},
{at: 1.5, expect: '0'},
]);
test_interpolation({
property: 'opacity',
from: 'unset',
to: '0.2',
}, [
{at: -0.3, expect: '1'},
{at: 0, expect: '1'},
{at: 0.3, expect: '0.76'},
{at: 0.6, expect: '0.52'},
{at: 1, expect: '0.2'},
{at: 1.5, expect: '0'},
]);
test_interpolation({
property: 'opacity',
from: '0',
to: '1'
}, [
{at: -0.3, expect: '0'}, // CSS opacity is [0-1].
{at: 0, expect: '0'},
{at: 0.3, expect: '0.3'},
{at: 0.6, expect: '0.6'},
{at: 1, expect: '1'},
{at: 1.5, expect: '1'}
]);
</script>
</body>
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