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layer-property-override.html
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<!DOCTYPE html>
<title>Resolving @property 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 {
width: 100px;
height: 100px;
}
#reference {
background-color: green;
}
</style>
<div id="target"></div>
<div id="reference"></div>
<script>
// In all tests, background color of #target should be green, same as #reference
const testCases = [
{
title: '@property unlayered overrides layered',
style: `
#target {
background-color: var(--foo);
}
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: green;
}
@layer {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: red;
}
}
`
},
{
title: '@property override between layers',
style: `
@layer base, override;
#target {
background-color: var(--foo);
}
@layer override {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: green;
}
}
@layer base {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: red;
}
}
`
},
{
title: '@property override update with appended sheet 1',
style: `
@layer base, override;
#target {
background-color: var(--foo);
}
@layer override {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: green;
}
}
`,
append: `
@layer base {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: red;
}
}
`
},
{
title: '@property override update with appended sheet 2',
style: `
@layer base, override;
#target {
background-color: var(--foo);
}
@layer base {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: red;
}
}
`,
append: `
@layer override {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: green;
}
}
`
},
];
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).backgroundColor,
getComputedStyle(reference).backgroundColor);
}, testCase['title']);
if (appendedStyle)
appendedStyle.remove();
documentStyle.remove();
}
</script>