<!doctype html>
<title>001-1</title>
<script>
onload = function() {
  var worker = new Worker('001-1.js');
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    var started = !!parent.date;
    parent.date = e.data;
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      parent.start_test()
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<a href='data:text/html,<title>foo</title><script>onload=function(){window.parent.postMessage({title: window.document.title}, "*")}</script>'>link</a>