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font-stretch-interpolation.html
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<!DOCTYPE html>
<meta charset="UTF-8">
<title>font-size interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-3/#propdef-font-size">
<meta name="assert" content="font-size supports animation as length">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>
<style>
.container {
font-stretch: ultra-expanded;
}
.container2 {
font-stretch: ultra-condensed;
}
.target {
display: inline-block;
font: 100px sans-serif;
font-stretch: normal;
}
.expected {
color: green;
margin-right: 30px;
}
</style>
<body>
<template id="target-template">
<span class="container">
<div class="target">TT</div>
</span>
</template>
<span id="inv-container" class="container">
<div id="inv-target" class="target">TT</div>
</span>
</body>
<script>
test_interpolation({
property: 'font-stretch',
from: '100%',
to: '200%'
}, [
{at: -2, expect: '0%'}, // CSS font-stretch can't be negative.
{at: -0.25, expect: '75%'},
{at: 0, expect: '100%'},
{at: 0.3, expect: '130%'},
{at: 0.6, expect: '160%'},
{at: 1, expect: '200%'},
{at: 1.5, expect: '250%'},
]);
test_interpolation({
property: 'font-stretch',
from: neutralKeyframe,
to: '200%'
}, [
{at: -2, expect: '0%'},
{at: -0.25, expect: '75%'},
{at: 0, expect: '100%'},
{at: 0.3, expect: '130%'},
{at: 0.6, expect: '160%'},
{at: 1, expect: '200%'},
{at: 1.5, expect: '250%'},
]);
test_interpolation({
property: 'font-stretch',
from: 'initial',
to: 'inherit'
}, [
{at: -2, expect: '0%'},
{at: -0.25, expect: '75%'},
{at: 0, expect: '100%'},
{at: 0.3, expect: '130%'},
{at: 0.6, expect: '160%'},
{at: 1, expect: '200%'},
{at: 1.5, expect: '250%'},
]);
// Test interpolation from keywords.
test_interpolation({
property: 'font-stretch',
from: 'normal',
to: 'ultra-expanded'
}, [
{at: -0.25, expect: '75%'},
{at: 0, expect: '100%'},
{at: 0.125, expect: '112.5%'},
{at: 0.25, expect: '125%'},
{at: 0.5, expect: '150%'},
{at: 0.75, expect: '175%'},
{at: 1, expect: '200%'},
]);
test_interpolation({
property: 'font-stretch',
from: 'ultra-condensed',
to: 'condensed'
}, [
{at: 0, expect: '50%'},
{at: 0.5, expect: '62.5%'},
{at: 1, expect: '75%'},
]);
test_interpolation({
property: 'font-stretch',
from: 'extra-condensed',
to: 'semi-condensed'
}, [
{at: 0, expect: '62.5%'},
{at: 0.5, expect: '75%'},
{at: 1, expect: '87.5%'},
]);
test_interpolation({
property: 'font-stretch',
from: 'condensed',
to: 'expanded'
}, [
{at: 0, expect: '75%'},
{at: 0.25, expect: '87.5%'},
{at: 0.5, expect: '100%'},
{at: 0.75, expect: '112.5%'},
{at: 1, expect: '125%'},
]);
test_interpolation({
property: 'font-stretch',
from: 'semi-condensed',
to: 'semi-expanded'
}, [
{at: 0, expect: '87.5%'},
{at: 0.5, expect: '100%'},
{at: 1, expect: '112.5%'},
]);
test_interpolation({
property: 'font-stretch',
from: 'normal',
to: 'extra-expanded'
}, [
{at: 0, expect: '100%'},
{at: 0.25, expect: '112.5%'},
{at: 0.5, expect: '125%'},
{at: 1, expect: '150%'},
]);
test(t => {
var container = document.getElementById('inv-container');
var target = document.getElementById('inv-target');
var anim = target.animate({fontStretch: ['normal', 'inherit']}, 1000);
anim.pause();
anim.currentTime = 500;
assert_equals(getComputedStyle(target).fontStretch, '150%');
container.setAttribute('class', 'container2');
assert_equals(getComputedStyle(target).fontStretch, '75%');
}, "An interpolation to inherit updates correctly on a parent style change.");
</script>