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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div style="height: 1000px; width: 1000px;"></div>
<div id="frag"></div>
<script>
promise_test(async t => {
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
assert_equals(window.scrollY, 0);
await navigation.navigate("#frag").finished;
assert_not_equals(window.scrollY, 0);
window.onpopstate = t.step_func(() => assert_not_equals(window.scrollY, 0));
window.onhashchange = t.step_func(() => assert_not_equals(window.scrollY, 0));
// The scroll restore should take place before navigatesuccess fires.
let navigatesuccess_called = false;
navigation.onnavigatesuccess = t.step_func(() => {
navigatesuccess_called = true;
assert_equals(window.scrollY, 0);
});
let back_promises = navigation.back();
navigation.onnavigate = t.step_func(e => {
e.intercept({ scroll: "after-transition",
handler: async () => {
// The ordering here should be:
// * intercept() is called
// * back_promises.committed is resolved
// * this handler runs.
// If this handler incorrectly blocks back_promises.committed,
// this test will hang.
await back_promises.committed;
assert_not_equals(window.scrollY, 0);
}
});
assert_not_equals(window.scrollY, 0);
});
await back_promises.finished;
assert_equals(window.scrollY, 0);
assert_true(navigatesuccess_called);
}, "scroll: after-transition should scroll when back completes, just before navigatesuccess");
</script>
</body>
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