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chromium/third_party/blink/web_tests/external/wpt/css/selectors/parsing/parse-state.html 

<!doctype html>
<meta charset="utf-8" />
<title>CSS Selectors: custom state pseudo selectors</title>
<link rel="help" href="https://github.com/w3c/csswg-drafts/pull/8213" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  test_valid_selector(":state(--foo)");
  test_valid_selector(":state(bar)");
  test_valid_selector(":state(--)");
  test_valid_selector(":state(--0)");
  test_valid_selector(":host(:state(--foo))");
  test_valid_selector('my-input[type="foo"]:state(checked)');
  test_valid_selector('my-input[type="foo"]:state(--0)::before');
  test_valid_selector('my-input[type="foo"]:state(--0)::part(inner)');
  test_valid_selector(
    'my-input[type="foo"]:state(--0)::part(inner):state(bar)',
  );
  test_valid_selector('::part(inner):state(bar)::before');
  test_valid_selector('::part(inner):state(bar)::after');
  test_invalid_selector(":state");
  test_invalid_selector(":state(");
  test_invalid_selector(":state()");
  test_invalid_selector(":state(0)");
  test_invalid_selector(":state(0rem)");
  test_invalid_selector(":state(url())");
  test_invalid_selector(":state(foo(1))");
  test_invalid_selector(":state(:host)");
  test_invalid_selector("my-input::after:state(foo)");
  test_invalid_selector('::part(inner):state(bar)::before:state(foo)');
  test_invalid_selector('::part(inner):state(bar)::after:state(foo)');
  test_invalid_selector("my-input::first-letter:state(foo)");
  test_invalid_selector('::slotted(foo):state(foo)');
</script>