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<!DOCTYPE html>
<html>
<title>View transitions: Transition in a hidden page</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/page-visibility/resources/window_state_context.js"></script>
<style>
::view-transition-group(*) {
animation-duration: 5s;
}
</style>
<script>
promise_test(async t => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
const wsc = window_state_context(t);
await wsc.minimize();
assert_true(document.hidden);
const transition = document.startViewTransition();
await wsc.restore();
await promise_rejects_dom(t, "InvalidStateError", transition.ready);
}, "A view transition should be immediately skipped if started when document is hidden");
promise_test(async t => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
const wsc = window_state_context(t);
const transition = document.startViewTransition(async () => {
await wsc.minimize();
});
let event_fired = false;
window.addEventListener("visibilitychange", () => {
if (document.hidden)
event_fired = true;
});
// Restoring so that the document has an opportunity to present the real
// frame and start the transition's animation.
await wsc.restore();
const [readyResult] = await Promise.allSettled([transition.ready]);
assert_true(event_fired, "visibilitychange event should fire before skipping the transition");
await transition.finished;
assert_equals(readyResult.status, "rejected");
}, "A view transition should be skipped when a document becomes hidden while processing update callback");
promise_test(async t => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
assert_false(document.hidden);
const wsc = window_state_context(t);
const transition = document.startViewTransition(() => { });
await transition.ready;
await new Promise(resolve => requestAnimationFrame(resolve));
await wsc.minimize();
const result = await new Promise(resolve => {
transition.finished.then(() => resolve("finished"));
t.step_timeout(() => resolve("timeout"), 1000);
});
assert_equals(result, "finished");
}, "A view transition should be skipped when a document becomes hidden while animating");
</script>
</body>
</html>
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