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<!doctype html>
<meta charset="utf-8">
<title>history.forward() uses this's associated document's browsing context to determine if navigation is allowed</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/history.html#dom-history-forward">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="sandboxedIframe" srcdoc="hello" sandbox="allow-scripts allow-same-origin"></iframe>
<script>
const t = async_test();
t.step(() => {
history.pushState({}, null, "?prev");
history.pushState({}, null, "?current");
history.back();
});
let isCrossRealmForward = false;
window.onpopstate = t.step_func(() => {
if (isCrossRealmForward) {
assert_equals(location.search, "?current");
t.done();
} else {
sandboxedIframe.contentWindow.history.forward.call(history);
isCrossRealmForward = true;
}
});
</script>
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