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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/scripting/events/onerroreventhandler.html 

<!doctype html>
<meta charset=utf-8>
<title>OnErrorEventHandler + ErrorEvent is treated differently</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
var t = async_test("onerror + ErrorEvent + Window");
var t2 = async_test("onerror + !ErrorEvent + Window");
var t3 = async_test("onerror + Document");
</script>
<iframe src="onerroreventhandler-frame.html"></iframe>