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chromium/third_party/blink/web_tests/external/wpt/websockets/interfaces/WebSocket/bufferedAmount/bufferedAmount-deleting.html 

<!doctype html>
<meta charset=utf-8>
<title>WebSockets: delete bufferedAmount</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(){
  var ws = new WebSocket(SCHEME_DOMAIN_PORT+'/echo');
  assert_equals(ws.bufferedAmount, 0, 'after creation');
  ws.close();
  delete ws.bufferedAmount;
  assert_equals(ws.bufferedAmount, 0,
                'after attempt to delete ws.bufferedAmount');
  delete WebSocket.prototype.bufferedAmount;
  assert_equals(ws.bufferedAmount, undefined,
                'after attempt to delete WebSocket.prototype.bufferedAmount');
});
</script>