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<!DOCTYPE html>
<title>CSS Cascade Layers: @property rule invalidation on layer order changes</title>
<link rel="help" href="https://drafts.csswg.org/css-cascade-5/#layering">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="stylesheet" href="/fonts/ahem.css">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#reference {
color: green;
--foo: green;
}
</style>
<div id=target>Lorem ipsum</div>
<div id=reference>Lorem ipsum</div>
<script>
const testCases = [
{
title: 'Insert layer invalidates @property',
sheets: [
'',
`
@layer first {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: green;
}
}
@layer second {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: red;
}
}
`,
],
update: function(sheets) {
sheets[0].insertRule('@layer second {}', 0);
},
property: '--foo',
},
{
title: 'Delete layer invalidates @property',
sheets: [
'@layer second {}',
`
@layer first {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: red;
}
}
@layer second {
@property --foo {
syntax: '<color>';
inherits: false;
initial-value: green;
}
}
`,
],
update: function(sheets) {
sheets[0].deleteRule(0);
},
property: '--foo',
},
];
for (let testCase of testCases) {
test(testObj => {
const styleElements = testCase.sheets.map(sheet => {
const element = document.createElement('style');
element.appendChild(document.createTextNode(sheet));
document.head.appendChild(element);
return element;
});
testObj.add_cleanup(() => {
for (let element of styleElements)
element.remove();
});
const sheets = styleElements.map(element => element.sheet);
testCase.update(sheets);
const actual = getComputedStyle(target).getPropertyValue(testCase.property);
const expected = getComputedStyle(reference).getPropertyValue(testCase.property);
assert_equals(actual, expected);
}, testCase.title);
}
</script>
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