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

<!doctype html>
<title>css-transitions IDL tests</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions/">
<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-transitions'],
    ['cssom', 'html', 'dom'],
    idl_array => {
      idl_array.add_objects({
        TransitionEvent: ['new TransitionEvent("transitionend")'],
        // These include GlobalEventHandlers
        Document: ['document'],
        HTMLElement: ['document'],
        Window: ['window'],
      })
    }
  );
</script>