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chromium/third_party/blink/web_tests/external/wpt/websockets/interfaces/WebSocket/close/close-basic.html 

<!doctype html>
<title>WebSockets: close()</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(SCHEME_DOMAIN_PORT+'/');
  ws.onclose = t.step_func(function(e) {
    assert_equals(e instanceof CloseEvent, true, 'e instanceof CloseEvent');
    assert_equals(e.wasClean, false, 'e.wasClean');
    e.wasClean = true;
    assert_equals(e.wasClean, false, 'e.wasClean = true');
    delete e.wasClean;
    assert_equals(e.wasClean, false, 'delete e.wasClean');
    delete CloseEvent.prototype.wasClean;
    assert_equals(e.wasClean, undefined, 'delete CloseEvent.prototype.wasClean');
    t.done();
  });
  ws.close();
  assert_equals(ws.readyState, ws.CLOSING);
});
</script>