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<!DOCTYPE html>
<meta charset="UTF-8">
<title>width interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#propdef-width">
<meta name="assert" content="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>
<style>
.parent {
width: 100px;
overflow: visible;
}
.target {
font-size: 16px;
background-color: black;
width: 10px;
height: 10px;
}
.expected {
background-color: green;
}
</style>
<body>
<template id="target-template">
<div class="container">
<div class="target"></div>
</div>
</template>
</body>
<script>
test_interpolation({
property: 'width',
from: neutralKeyframe,
to: '40px',
}, [
{at: -0.3, expect: '1px'},
{at: 0, expect: '10px'},
{at: 0.3, expect: '19px'},
{at: 0.6, expect: '28px'},
{at: 1, expect: '40px'},
{at: 1.5, expect: '55px'},
]);
test_no_interpolation({
property: 'width',
from: 'initial',
to: '40px',
});
test_interpolation({
property: 'width',
from: 'inherit',
to: '40px',
}, [
{at: -0.3, expect: '118px'},
{at: 0, expect: '100px'},
{at: 0.3, expect: '82px'},
{at: 0.6, expect: '64px'},
{at: 1, expect: '40px'},
{at: 1.5, expect: '10px'},
]);
test_no_interpolation({
property: 'width',
from: 'unset',
to: '40px',
});
test_interpolation({
property: 'width',
from: '0px',
to: '100px',
}, [
{at: -0.3, expect: '0px'}, // CSS width can't be negative.
{at: 0, expect: '0px'},
{at: 0.3, expect: '30px'},
{at: 0.6, expect: '60px'},
{at: 1, expect: '100px'},
{at: 1.5, expect: '150px'}
]);
test_interpolation({
property: 'width',
from: '10px',
to: '100%'
}, [
{at: -0.3, expect: '0px'}, // CSS width can't be negative.
{at: 0, expect: '10px'},
{at: 0.3, expect: '37px'},
{at: 0.6, expect: '64px'},
{at: 1, expect: '100px'},
{at: 1.5, expect: '145px'}
]);
// The "vw" unit equals to 1% of the width of the viewport's initial containing
// block:
// https://developer.mozilla.org/en-US/docs/Web/CSS/length
function vw(x) {
return (x * window.innerWidth / 100);
}
// In here, 16 is the font-size which is the value of 1em, and vw(10) is the
// value of 10vw. The calc here takes the "at" in the next interpolation test
// and computes the expected value.
function calc(x) {
return Math.max(16 + (vw(10) - 16) * x, 0).toFixed(2) + "px";
}
test_interpolation({
property: 'width',
from: '1em',
to: '10vw'
}, [
{at: -0.3, expect: calc(-0.3)},
{at: 0, expect: calc(0)},
{at: 0.3, expect: calc(0.3)},
{at: 0.6, expect: calc(0.6)},
{at: 1, expect: calc(1)},
{at: 1.5, expect: calc(1.5)}
]);
</script>
</body>
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