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<!doctype html>
<meta charset="utf-8">
<title>Check that sandboxed iframe can not navigate their ancestors</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
var t = async_test();
onpopstate = t.unreached_func('no pop state');
function doNavigation() {
history.pushState( {state: "one past"}, 'page 2', '');
frames[0].postMessage('back', '*');
t.step_timeout(() => {
t.done();
}, 1000);
}
</script>
<iframe id="child_frame" sandbox="allow-scripts" src="support/iframe-tried-to-be-navigated-by-history.html" onload="doNavigation();"></iframe>
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