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Test Info:

<!DOCTYPE HTML>
<html>
<body onload="test();">
<script>
function test() {
// Test that calling pushState() with a state object which calls
// history.back() doesn't crash. We need to make sure that there's at least
// one entry in the history before we do anything else.
history.pushState(null, "");
x = {};
x.toJSON = { history.back(); return "{a:1}"; };
history.pushState(x, "");
}
</script>
</body>
</html>