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chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/idlharness.html 

<!doctype html>
<title>CSS Pseudo Element API IDL tests</title>
<meta name="timeout" content="long">
<link rel="help" href="https://drafts.csswg.org/css-pseudo-4/#cssom">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/WebIDLParser.js"></script>
<script src="/resources/idlharness.js"></script>
<script>
'use strict';

idl_test(
  ['css-pseudo'],
  ['cssom', 'html', 'dom'],
  idl_array => {
    idl_array.add_objects({
      Window: ['window'],
      CSSPseudoElementList: ['beforeElements'],
      CSSPseudoElement: ['beforeElements.item(0)'],
    });

    window.beforeElements =
      window.getPseudoElements(document.body, 'before');
  }
);
</script>