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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/helpers.js"></script>
<script src="/common/utils.js"></script>
<body>
<script>
const tests = [
["204s", "204"],
["205s", "205"],
["Content-Disposition: attachment responses", "download"]
];
for (const [description, action] of tests) {
promise_test(async t => {
const id = token();
const i = document.createElement("iframe");
i.src = `resources/204-205-download-on-second-visit.py?id=${id}`;
document.body.append(i);
await new Promise(r => i.onload = r);
// Configure it to return a 204 on the next visit
await fetch(i.src + `&action=${action}`, { method: "POST" });
// Now navigate elsewhere
i.contentWindow.location.href = "/common/blank.html";
await new Promise(r => i.onload = r);
// Now try going back. It should do nothing (and not tell us about the result).
const indexBefore = i.contentWindow.navigation.currentEntry.index;
// One might be surprised that navigate does not fire. (It does fire for the
// corresponding tests of navigation.navigate(), i.e., this is
// traversal-specific behavior.) See https://github.com/WICG/navigation-api/issues/207
// for some discussion.
i.contentWindow.navigation.onnavigate = t.unreached_func("onnavigate should not be called");
i.contentWindow.navigation.onnavigatesuccess = t.unreached_func("onnavigatesuccess should not be called");
i.contentWindow.navigation.onnavigateerror = t.unreached_func("onnavigateerror should not be called");
const result = i.contentWindow.navigation.back();
assertNeverSettles(t, result, i.contentWindow);
await new Promise(resolve => t.step_timeout(resolve, 50));
assert_equals(i.contentWindow.navigation.currentEntry.index, indexBefore);
assert_equals(i.contentWindow.navigation.transition, null);
}, `back() promises to ${description} never settle`);
}
</script>
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