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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/scripting/processing-model-2/addEventListener.html 

<!doctype html>
<html>
 <head>
  <title>window.onerror - addEventListener</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
 </head>
 <body>
  <div id=log></div>
  <script>
    setup({allow_uncaught_exception:true});
    var t = async_test();
    var ran = false;
    window.addEventListener('error', t.step_func(function(e){
        ran = true;
        assert_true(e.isTrusted, 'isTrusted');
    }), false);
  </script>
  <script>
    undefined_variable;
  </script>
  <script>
    for (;) {}
  </script>
  <script>
    t.step(function(){
        assert_true(ran, 'ran');
        t.done();
    });
  </script>
 </body>
</html>