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chromium/third_party/blink/web_tests/http/tests/websocket/resources/reload-crash-iframe.html 

<html>
<head>
<script src="/js-test-resources/js-test.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script type="text/javascript">
var reloadCount = parent.document.iframeReady();
if (!reloadCount) {
    var ws = new WebSocket("ws://127.0.0.1:8880/close-on-unload");
    location.reload();
}
</script>
</body>
</html>