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<!DOCTYPE html>
<p>This is a frame that tries to navigate via history API.</p>
<script>
window.onmessage = (e) => {
if (e.data == 'back') {
history.back();
} else if (e.data == 'forward') {
history.forward();
} else if (e.data = 'pushstateback') {
onpopstate = (e) => {
parent.postMessage('pushstatebackdone', '*');
};
history.pushState({someState: 'blah'}, '');
history.back();
}
};
</script>