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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Selectors: The heading pseudo-classes</title>
<link rel="help" href="https://drafts.csswg.org/selectors-5/#headings">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
test_valid_selector(':heading');
test_valid_selector(':heading(2)');
test_valid_selector(':heading(99999)');
test_valid_selector(':heading(0)');
test_valid_selector(':heading(0, 1, 2)');
test_valid_selector(':heading(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)');
test_valid_selector(':heading(-1)');
test_valid_selector('h1:heading');
test_valid_selector('h1:heading(1)');
test_valid_selector('h1:heading(2)');
test_invalid_selector(':heading()');
test_invalid_selector(':heading(1.0)');
test_invalid_selector(':heading(1.4)');
test_invalid_selector(':heading(n)');
test_invalid_selector(':heading(odd)');
test_invalid_selector(':heading(even)');
test_invalid_selector(':heading(2n)');
test_invalid_selector(':heading(2n+1)');
test_invalid_selector(':heading(2n+2)');
test_invalid_selector(':heading(-n+3)');
test_invalid_selector(':heading(2n, 3n)');
test_invalid_selector(':heading(2, 3n)');
test_invalid_selector(':heading(2 of .foo)');
test_invalid_selector(':heading(2n of .foo)');
test_invalid_selector(':heading(calc(1))');
test_invalid_selector(':heading(max(1, 2))');
test_invalid_selector(':heading(min(1, 2)');
test_invalid_selector(':heading(var(--level))');
</script>
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