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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors: The relational pseudo-class (disallow nesting :has() inside :has())</title>
<link rel="author" title="Byungwoo Lee" href="mailto:blee@igalia.com">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#has-pseudo">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
test_invalid_selector('.a:has(.b:has(.c))');
test(() => {
// It's not easy to check that these are invalid because :is() and :where()
// use forgiving parsing. Check that they never match instead.
assert_false(document.documentElement.matches(":has(:is(:has(*)))"));
assert_false(document.documentElement.matches(":has(:where(:has(*)))"));
assert_true(document.documentElement.matches(":has(:is(:has(*), script))"));
assert_true(document.documentElement.matches(":has(:where(:has(*), script))"));
})
</script>
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