history-back-forward-within-subframe-hash.html

<!DOCTYPE html>
<html>
<head>
  <script src="../../resources/js-test.js"></script>
</head>
<body>
<p id="description"></p>
<pre id="console"></pre>

<iframe src="resources/subframe.html" id="iframe1"></iframe>

<script>
description('Ensures that repeated back and forward work for frame hash navigations.');

var frame = document.getElementById("iframe1").contentWindow;
onload = function()
{
    // Make sure that we can generate history entries
    setTimeout(runTest, 0);
}

// 1. Navigate to hash "#foo".
// 2. Go back to hash "".
// 3. Go forward to hash "#foo".
function runTest()
{
    frame.location.hash = "#foo";
}

frame.onhashchange = function()
{
    if (frame.location.hash == "#foo") {
        if (!window.localStorage.beenHere) {
            window.localStorage.beenHere = true;
            debug("First visit to foo.");
            history.back();
        } else {
            delete window.localStorage.beenHere;
            debug("Gone forward.");
            finishJSTest();
        }
    }
    if (frame.location.hash == "") {
        debug("Gone back.");
        history.forward();
    }
}
var jsTestIsAsync = true;
</script>  
</body>
</html>

chromium/third_party/blink/web_tests/fast/history/history-back-forward-within-subframe-hash.html