<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<iframe id="i" src="resources/empty.html"></iframe>
<script>
promise_test(async t => {
// Wait for onload so push navigations don't get converted to replace.
await new Promise(r => window.onload = () => t.step_timeout(r, 0));
await navigation.navigate("#forward").finished;
i.contentWindow.navigation.navigate("empty.html?forward");
await new Promise(r => i.onload = r);
navigation.onnavigate = () => {
// Dummy so that the browser process knows there's a navigate event handler.
}
// Now navigate both windows back. The main frame will navigate
// same-document quickly, but the cross-document iframe navigation will
// stall on this slow beforeunload handler. The browser process shouldn't
// crash when the iframe cross-document navigation returns to the browser
// when beforeunload completes.
i.contentWindow.onbeforeunload = () => {
let end = performance.now() + 20;
let dummy = 0;
while (performance.now() < end) {
dummy++;
}
}
let main_frame_finished_promise = navigation.back().finished;
// Both windows should successfully navigate.
await new Promise(r => i.onload = r);
await main_frame_finished_promise;
});
</script>
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