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layer-counter-style-override.html
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<!DOCTYPE html>
<title>Resolving @counter-style 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, #reference {
font-family: monospace;
width: min-content;
}
#reference::before {
content: '0000';
}
@counter-style three {
system: cyclic;
symbols: '000';
}
@counter-style four {
system: cyclic;
symbols: '0000';
}
</style>
<ul>
<li id="target"></li>
<li id="reference"></li>
</ul>
<script>
// In all tests, #target::before should have 4 characters, same as #reference.
const testCases = [
{
title: '@counter-style unlayered overrides layered',
style: `
#target::before {
content: counter(dont-care, custom-counter-style);
}
@counter-style custom-counter-style {
system: extends four;
}
@layer {
@counter-style custom-counter-style {
system: extends three;
}
}
`
},
{
title: '@counter-style override between layers',
style: `
@layer base, override;
#target::before {
content: counter(dont-care, custom-counter-style);
}
@layer override {
@counter-style custom-counter-style {
system: extends four;
}
}
@layer base {
@counter-style custom-counter-style {
system: extends three;
}
}
`
},
{
title: '@counter-style override update with appended sheet 1',
style: `
@layer base, override;
#target::before {
content: counter(dont-care, custom-counter-style);
}
@layer override {
@counter-style custom-counter-style {
system: extends four;
}
}
`,
append: `
@layer base {
@counter-style custom-counter-style {
system: extends three;
}
}
`
},
{
title: '@counter-style override update with appended sheet 2',
style: `
@layer base, override;
#target::before {
content: counter(dont-care, custom-counter-style);
}
@layer base {
@counter-style custom-counter-style {
system: extends three;
}
}
`,
append: `
@layer override {
@counter-style custom-counter-style {
system: extends four;
}
}
`
},
];
for (let testCase of testCases) {
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);
}
test(function () {
assert_equals(getComputedStyle(target).width,
getComputedStyle(reference).width);
}, testCase['title']);
if (appendedStyle)
appendedStyle.remove();
documentStyle.remove();
}
</script>