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chromium
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chromium/third_party/blink/web_tests/fast/harness/resources/cached-page-2.html 

<script>
function init() {
    window.opener.canExit = true;
    window.opener.log('page-2, about to go back to page-1');
    history.back();
}
</script>
<body onload="init()"></body>