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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /navigation-api/navigate-event/defer/tentative/defer-back.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<title>
navigateEvent.deferPageSwap: deferring is not allowed for cross-document traverse
navigations
</title>
<script>
switch (new URLSearchParams(location.search).get("phase") || "test") {
case "test":
promise_test(async (t) => {
await new Promise((resolve) => {
window.onload = resolve;
});
window.step_timeout = t.step_timeout;
const done = Promise.withResolvers();
window.did_load = done.resolve;
const popup = window.open("?phase=initial");
const events = await done.promise;
assert_array_equals(events, ["navigate", "pagehide"]);
});
break;
case "initial":
window.onload = () => {
// Changing the URL synchronously to avoid an infinite loop when going back in case there is
// no BFCache.
history.replaceState(null, "", "?phase=done");
navigation.navigate("?phase=next", { history: "push" });
}
break;
case "next":
window.onload = () => {
const events = [];
navigation.addEventListener("navigate", (navigate_event) => {
events.push("navigate");
assert_throws_dom("SecurityError", () =>
navigate_event.deferPageSwap({
handler: () =>
new Promise((resolve) => {
events.push("handler");
window.opener.step_timeout(() => {
events.push("preview");
resolve();
});
}),
})
);
});
window.addEventListener("pagehide", () => {
events.push("pagehide");
window.opener.did_load(events);
});
window.navigation.back();
}
break;
case "done":
break;
}
</script>