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chromium/third_party/blink/web_tests/fast/history/resources/history-back-within-subframe-url-2.html 

<body onload="init()">
<script>
function init()
{
    if (!parent.wentBack)
        setTimeout(function() {window.location.href = 'history-back-within-subframe-url-3.html';}, 0);
}
</script>
frame 2
</body>