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

<!doctype html>
<meta charset="utf-8" />
<title>CSS Selectors: slotted pseudo selectors</title>
<link rel="help" href="https://drafts.csswg.org/css-scoping/#slotted-pseudo" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  test_valid_selector("::slotted(bar)");
  test_valid_selector('::slotted([attr="foo"])');
  test_valid_selector("::slotted(*)");
  test_valid_selector("::slotted(.class)");
  test_valid_selector("::slotted(:not(foo))");
  test_valid_selector('::slotted(:not(:nth-last-of-type(2)):not([slot="foo"]))');
  test_valid_selector("::slotted(:first-child)");
  test_valid_selector("::slotted(:hover)");
  test_invalid_selector("::slotted");
  test_invalid_selector("::slotted()");
  test_invalid_selector("::slotted(0)");
  test_invalid_selector(":slotted(foo)");
  test_invalid_selector("::slotted(foo):first-child");
  test_invalid_selector("::slotted(foo):hover");
  test_invalid_selector("::slotted(foo):focus");
  test_invalid_selector("::slotted(foo):lang(en)");
  test_invalid_selector("::slotted(foo):dir(ltr)");
  test_invalid_selector('::slotted(foo) + ::slotted(bar)');
</script>