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chromium/third_party/blink/web_tests/external/wpt/websockets/unload-a-document/001.html 

<!doctype html>
<title>WebSockets: navigating top-level browsing context</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/common/utils.js></script>
<script src=../constants.sub.js></script>
<meta name="variant" content="?default">
<meta name="variant" content="?wss">
<meta name="variant" content="?wpt_flags=h2">
<p>Test requires popup blocker disabled</p>
<div id=log></div>
<script>
var t = async_test();
var w;
var uuid;
t.step(function() {
  uuid = token()
  w = window.open("001-1.html" + location.search);
  add_result_callback(function() {
    w.close();
  });
});
navigate = t.step_func(function() {
  w.location = w.location.href.replace("001-1.html", "001-2.html");
});
</script>