<!DOCTYPE html>
<meta charset="utf-8">
<title>Parent main frame cancels a same-origin child whose navigation is pending</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<!--
This test asserts that a parent canceling a same-origin child's cross-origin
navigation does not result in load events firing synchronously in the parent
-->
<body>
<iframe src=resources/slow.py></iframe>
<script>
promise_test(async t => {
let window_load_fired = false;
let iframe_load_fired = false;
const iframe = document.querySelector('iframe');
const window_load_promise = new Promise(resolve => {
window.onload = () => {
window_load_fired = true;
resolve();
}
});
const iframe_onload_promise = new Promise(resolve => {
iframe.onload = () => {
iframe_load_fired = true;
resolve();
}
});
// While the child navigation is in-flight, cancel it and record when the
// parent `load` event fires.
window.frames[0].location.href = "resources/slow.py?different";
// Synchronously after cancelation, no load events should have been fired.
assert_false(window_load_fired,
"Parent's load event does not synchronously fire after cancelation");
assert_false(iframe_load_fired,
"<iframe> load event does not synchronously fire after cancelation");
// Load events did not fire in a microtask after cancelation.
await Promise.resolve();
assert_false(window_load_fired,
"Parent's load event does not fire in the microtask after cancelation");
assert_false(iframe_load_fired,
"<iframe> load event does not fire in the microtask after cancelation");
// Canceling the navigation should unblock the parent's load event, but the
// new iframe navigation should still be pending, and the iframe load event
// shouldn't fire until *that one* is complete.
await window_load_promise;
assert_true(window_load_fired,
"Parent's load event fires asynchronously after child navigation cancelation");
assert_false(iframe_load_fired,
"<iframe> load event does not fire until subsequent navigation is complete");
}, "parent cancels a pending navigation in a same-origin child");
</script>
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