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layer-font-face-override.html
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<!DOCTYPE html>
<title>Resolving @keyframe name conflicts with cascade layers</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#layering">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#target {
font-size: 20px;
width: min-content;
}
</style>
<div id="target">Test</div>
<script>
// In all tests, width of #target should be 80px.
const testCases = [
{
title: '@font-face unlayered overrides layered',
style: `
#target {
font-family: custom-font;
}
@font-face {
font-family: custom-font;
src: url('/fonts/Ahem.ttf');
}
@layer {
@font-face {
font-family: custom-font;
src: url('/fonts/noto/noto-sans-v8-latin-regular.woff') format('woff');
}
}
`
},
{
title: '@font-face override between layers',
style: `
@layer base, override;
#target {
font-family: custom-font;
}
@layer override {
@font-face {
font-family: custom-font;
src: url('/fonts/Ahem.ttf');
}
}
@layer base {
@font-face {
font-family: custom-font;
src: url('/fonts/noto/noto-sans-v8-latin-regular.woff') format('woff');
}
}
`
},
{
title: '@font-face override update with appended sheet 1',
style: `
@layer base, override;
#target {
font-family: custom-font;
}
@layer override {
@font-face {
font-family: custom-font;
src: url('/fonts/Ahem.ttf');
}
}
`,
append: `
@layer base {
@font-face {
font-family: custom-font;
src: url('/fonts/noto/noto-sans-v8-latin-regular.woff') format('woff');
}
}
`
},
{
title: '@font-face override update with appended sheet 2',
style: `
@layer base, override;
#target {
font-family: custom-font;
}
@layer base {
@font-face {
font-family: custom-font;
src: url('/fonts/noto/noto-sans-v8-latin-regular.woff') format('woff');
}
}
`,
append: `
@layer override {
@font-face {
font-family: custom-font;
src: url('/fonts/Ahem.ttf');
}
}
`
},
];
for (let testCase of testCases) {
promise_test(async () => {
var documentStyle = document.createElement('style');
documentStyle.appendChild(document.createTextNode(testCase['style']));
document.head.appendChild(documentStyle);
var appendedStyle;
if (testCase['append']) {
document.body.offsetLeft; // Force style update
appendedStyle = document.createElement('style');
appendedStyle.appendChild(document.createTextNode(testCase['append']));
document.head.appendChild(appendedStyle);
}
await document.fonts.load('20px/1 custom-font');
assert_equals(getComputedStyle(target).width, '80px');
if (appendedStyle)
appendedStyle.remove();
documentStyle.remove();
}, testCase['title']);
}
</script>