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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="return-value/resources/helpers.js"></script>
<iframe id="i" src="/common/blank.html?startI" sandbox="allow-scripts allow-same-origin"></iframe>
<script>
// Intended setup:
// Step 0:
// - Parent: (current URL)
// - i: /common/blank.html?startI
// Step 1:
// - Parent: (current URL)
// - i: resources/navigation-back.html
// Step 2:
// - Parent: (current URL)#end
// - i: resources/navigation-back.html
//
// Then, calling navigation.back() in i will take is from step 2 to step 0, which would navigate the parent.
// That is not allowed, so the call to back() must reject.
promise_test(async t => {
await new Promise(resolve => window.onload = resolve);
i.contentWindow.location.href = new URL("resources/navigation-back.html", location.href);
await new Promise(resolve => i.onload = resolve);
location.hash = "#end";
await new Promise(resolve => window.onhashchange = resolve);
navigation.onnavigate = t.unreached_func("navigate must not fire");
navigation.onnavigateerror = t.unreached_func("navigateerror must not fire");
window.onpopstate = t.unreached_func("popstate must not fire");
window.onhashchange = t.unreached_func("hashchange must not fire");
await assertBothRejectDOM(t, i.contentWindow.doNavigationBack(), "SecurityError", i.contentWindow);
}, "A sandboxed iframe cannot navigate its parent via its own navigation object by using back()");
</script>
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