<!DOCTYPE html>
<html lang="en-US">
<body>
<script>
window.onpopstate = function(event) {
alert("location: " + document.location + ", state: " + JSON.stringify(event.state));
};
history.pushState({page: 1}, "title a", "?page=1");
history.pushState({page: 2}, "title b", "?page=2");
history.back();
</script> </body>
</html>