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LibWeb: Interpolate font-style values correctly

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These are interpolated by computed value, except a value of `normal` is
treated as `oblique 0deg`.
This commit is contained in:
Tim Ledbetter 2025-05-02 13:58:00 +01:00 • committed by Andreas Kling
commit 23009779e1
Notes: github-actions[bot] 2025-05-03 10:06:19 +00:00
3 changed files with 276 additions and 0 deletions
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122
Tests/LibWeb/Text/input/wpt-import/css/css-fonts/animations/font-style-interpolation.html Normal file
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<!DOCTYPE html>
<meta charset="UTF-8">
<title>font-style interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-3/#propdef-font-style">
<meta name="assert" content="Font-style should be animated smoothly.">
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<script src="../../../css/support/interpolation-testcommon.js"></script>
<style>
.container {
font-style: oblique 20deg;
}
.container2 {
font-style: oblique 5deg;
}
.target {
display: inline-block;
font: 100px sans-serif;
font-style: 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-style',
from: 'normal',
to: 'oblique 10deg'
}, [
{at: -2, expect: 'oblique -20deg'},
{at: -0.25, expect: 'oblique -2.5deg'},
{at: 0, expect: 'normal'},
{at: 0.3, expect: 'oblique 3deg'},
{at: 0.6, expect: 'oblique 6deg'},
{at: 1, expect: 'oblique 10deg'},
{at: 1.5, expect: 'oblique 15deg'},
]);
test_interpolation({
property: 'font-style',
from: 'oblique 5deg',
to: 'oblique 15deg'
}, [
{ at: -2, expect: 'oblique -15deg' },
{ at: -0.25, expect: 'oblique 2.5deg' },
{ at: 0, expect: 'oblique 5deg' },
{ at: 0.3, expect: 'oblique 8deg' },
{ at: 0.6, expect: 'oblique 11deg' },
{ at: 1, expect: 'oblique 15deg' },
{ at: 1.5, expect: 'oblique 20deg' },
]);
test_interpolation({
property: 'font-style',
from: 'initial',
to: 'inherit'
}, [
{ at: -2, expect: 'oblique -40deg' },
{ at: -0.25, expect: 'oblique -5deg' },
{ at: 0, expect: 'normal' },
{ at: 0.3, expect: 'oblique 6deg' },
{ at: 0.6, expect: 'oblique 12deg' },
{ at: 1, expect: 'oblique 20deg' },
{ at: 1.5, expect: 'oblique 30deg' },
]);
test_interpolation({
property: 'font-style',
from: 'oblique 20deg',
to: 'normal'
}, [
{ at: -1, expect: 'oblique 40deg' },
{ at: 0, expect: 'oblique 20deg' },
{ at: 0.5, expect: 'oblique 10deg' },
{ at: 1, expect: 'normal' },
{ at: 1.5, expect: 'oblique -10deg' },
]);
test_interpolation({
property: 'font-style',
from: 'oblique -90deg',
to: 'oblique 90deg'
}, [
{ at: -2, expect: 'oblique -90deg' },
{ at: -1, expect: 'oblique -90deg' },
{ at: 0, expect: 'oblique -90deg' },
{ at: 0.5, expect: 'normal' },
{ at: 1, expect: 'oblique 90deg' },
{ at: 1.5, expect: 'oblique 90deg' },
]);
test(t => {
var container = document.getElementById('inv-container');
var target = document.getElementById('inv-target');
var anim = target.animate({ fontStyle: ['normal', 'inherit'] }, 1000);
anim.pause();
anim.currentTime = 500;
assert_equals(getComputedStyle(target).fontStyle, 'oblique 10deg');
container.setAttribute('class', 'container2');
assert_equals(getComputedStyle(target).fontStyle, 'oblique 2.5deg');
}, "An interpolation to inherit updates correctly on a parent style change.");
</script>