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anchor-query-custom-property-registration.html
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<!DOCTYPE html>
<title>Tests using anchor queries in custom property initial value</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/">
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api/#register-a-custom-property">
<link rel="author" href="mailto:xiaochengh@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup(() => assert_own_property(CSS, 'registerProperty'));
// Anchor queries are not computationally independent, so they cannot be used
// in the initial value of any typed custom property.
test(() => assert_throws_dom(
'SyntaxError',
() => CSS.registerProperty({
name: '--x',
syntax: '<length>',
inherits: false,
initialValue: 'anchor(--foo top)',
})), 'anchor() cannot be used as <length> initial value');
test(() => assert_throws_dom(
'SyntaxError',
() => CSS.registerProperty({
name: '--x',
syntax: '<length>',
inherits: false,
initialValue: 'anchor-size(--foo width)',
})), 'anchor-size() cannot be used as <length> initial value');
test(() => assert_throws_dom(
'SyntaxError',
() => CSS.registerProperty({
name: '--x',
syntax: '<length-percentage>',
inherits: false,
initialValue: 'anchor(--foo top)',
})), 'anchor() cannot be used as <length-percentage> initial value');
test(() => assert_throws_dom(
'SyntaxError',
() => CSS.registerProperty({
name: '--x',
syntax: '<length-percentage>',
inherits: false,
initialValue: 'anchor-size(--foo width)',
})), 'anchor-size() cannot be used as <length-percentage> initial value');
</script>