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chromium/third_party/blink/web_tests/external/wpt/websockets/interfaces/WebSocket/events/020.html 

<!doctype html>
<title>WebSockets: error events</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=../../../constants.sub.js></script>
<meta name="variant" content="?default">
<meta name="variant" content="?wss">
<div id=log></div>
<script>
async_test(function(t) {
  var ws = new WebSocket('ws://example.invalid/');
  ws.onerror = t.step_func(function(e) {
    assert_true(e instanceof Event);
    t.done();
  })
});
</script>