chromium/third_party/blink/web_tests/external/wpt/websockets/interfaces/WebSocket/readyState/003.html

<!doctype html>
<title>WebSockets: delete readyState</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>
test(function(t) {
  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/');
  ws.close();
  delete ws.readyState;
  assert_equals(ws.readyState, ws.CLOSING, 'delete ws.readyState');
  delete WebSocket.prototype.readyState;
  assert_equals(ws.readyState, undefined, 'delete WebSocket.prototype.readyState');
});
</script>