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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-properties-values-api/at-property-stylesheets.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>Verify that the correct registration is selected for mutated stylesheets</title>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#determining-registration">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/utils.js"></script>
<div id=div></div>
<script>
test(() => {
with_at_property({
syntax: '"<length>"',
inherits: false,
initialValue: '1px'
}, (name) => {
assert_equals(getComputedStyle(div).getPropertyValue(name), '1px');
});
}, '@property detected when stylesheet appears');
test(() => {
let name = generate_name();
with_at_property({
name: name,
syntax: '"<length>"',
inherits: false,
initialValue: '1px'
}, (name) => {
assert_equals(getComputedStyle(div).getPropertyValue(name), '1px');
});
assert_equals(getComputedStyle(div).getPropertyValue(name), '');
}, '@property removal detected when last @property rule disappears');
test(() => {
with_at_property({
syntax: '"<length>"',
inherits: false,
initialValue: '1px'
}, (name1) => {
with_at_property({
syntax: '"<length>"',
inherits: false,
initialValue: '2px'
}, (name2) => {
assert_equals(getComputedStyle(div).getPropertyValue(name2), '2px');
});
});
}, '@property detected in second stylesheet');
test(() => {
let name2 = generate_name();
with_at_property({
syntax: '"<length>"',
inherits: false,
initialValue: '1px'
}, (name1) => {
with_at_property({
name2: name2,
syntax: '"<length>"',
inherits: false,
initialValue: '2px'
}, (name2) => {
assert_equals(getComputedStyle(div).getPropertyValue(name2), '2px');
});
assert_equals(getComputedStyle(div).getPropertyValue(name2), '');
});
}, '@property removal detected with removal of second stylesheet');
test(() => {
let name1 = generate_name();
let name2 = generate_name();
let sheet1 = `
@property ${name1} {
inherits: false;
syntax: "<length>";
initial-value: 1px;
}
`;
let sheet2 = `
@property ${name2} {
inherits: false;
syntax: "<length>";
initial-value: 2px;
}
`;
let node1 = document.createElement('style');
let node2 = document.createElement('style');
node1.textContent = sheet1;
node2.textContent = sheet2;
try {
document.body.append(node1, node2);
assert_equals(getComputedStyle(div).getPropertyValue(name1), '1px');
assert_equals(getComputedStyle(div).getPropertyValue(name2), '2px');
node1.remove();
assert_equals(getComputedStyle(div).getPropertyValue(name1), '');
assert_equals(getComputedStyle(div).getPropertyValue(name2), '2px');
} finally {
node1.remove();
node2.remove();
}
}, '@property removal detected with removal of first stylesheet');
</script>