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chromium/third_party/blink/web_tests/external/wpt/websockets/interfaces/WebSocket/readyState/001.html 

<!doctype html>
<title>WebSockets: getting readyState in connecting</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) {
  assert_equals((new WebSocket(SCHEME_DOMAIN_PORT+'/')).readyState, WebSocket.CONNECTING);
});
</script>