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chromium
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chromium/third_party/blink/web_tests/fast/dom/Window/Location/resources/pass.html 

<html>
<head>
<script>
function finishTest() {
  window.parent.postMessage("done", "*");
}
</script>
</head>
<body onload="finishTest()">
<pre>
PASS
</pre>
</body>
</html>