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<!DOCTYPE html>
<title>CSS Syntax: Rules that look like custom properties</title>
<link rel="help" href="https://drafts.csswg.org/css-syntax/#consume-qualified-rule">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style id=stylesheet1>
.a { }
--x:hover { } /* Ambiguous "rule" */
.b { }
</style>
<script>
test(() => {
let rules = stylesheet1.sheet.rules;
assert_equals(rules.length, 2);
assert_equals(rules[0].selectorText, '.a');
assert_equals(rules[1].selectorText, '.b');
}, 'Rule that looks like a custom property declaration is ignored');
</script>
<!-- https://github.com/w3c/csswg-drafts/issues/9336 -->
<style id=stylesheet2>
.a { }
--x:hover { ] } /* Ambiguous "rule" */
.b { }
</style>
<script>
test(() => {
let rules = stylesheet2.sheet.rules;
assert_equals(rules.length, 2);
assert_equals(rules[0].selectorText, '.a');
assert_equals(rules[1].selectorText, '.b');
}, 'Rule that looks like an invalid custom property declaration is ignored');
</script>
<style id=stylesheet3>
div {
.a { }
--x:hover { }
.b { }
}
</style>
<script>
test(() => {
let rules = stylesheet3.sheet.rules;
assert_equals(rules.length, 1);
assert_equals(rules[0].selectorText, 'div');
let div = rules[0];
let childRules = div.cssRules;
assert_equals(childRules.length, 2);
assert_equals(childRules[0].selectorText, '& .a');
assert_true(childRules[1] instanceof CSSNestedDeclarations)
let x = childRules[1].style.getPropertyValue('--x');
assert_equals(x.trim(), 'hover { }\n .b { }');
}, 'Nested rule that looks like a custom property declaration');
</script>
<!-- https://github.com/w3c/csswg-drafts/issues/9336 -->
<style id=stylesheet4>
div {
.a { }
--x:hover { ] }
.b { }
}
</style>
<script>
test(() => {
let rules = stylesheet4.sheet.rules;
assert_equals(rules.length, 1);
assert_equals(rules[0].selectorText, 'div');
let div = rules[0];
// There is no valid --x declaration, because mismatched ] is not allowed
// in custom properties.
let x = div.style.getPropertyValue('--x');
assert_equals(x, '');
// We should also not have restarted parsing as a nested style rule,
// and instead we should have "consumed the remnants of a bad declaration",
// which skips to the next semicolon (or end-of-block).
// So in other words, there should be no nested '.b.' child rule here.
let childRules = div.cssRules;
assert_equals(childRules.length, 1);
assert_equals(childRules[0].selectorText, '& .a');
}, 'Nested rule that looks like an invalid custom property declaration');
</script>
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