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<!DOCTYPE html>
<title>
View transition promise reactions in incoming page should resolve before
the rendering continues (rAF, style/layout etc)
</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const params = new URLSearchParams(location.search.substr(1));
const is_starting_page = !params.has('new');
if (is_starting_page) {
requestAnimationFrame(() => requestAnimationFrame( () => {
location.replace(location.href + '?new');
}));
} else {
promise_test(async () => {
const sequence = [];
requestAnimationFrame(() => {
sequence.push("rAF");
Promise.resolve().then(() => {
sequence.push("rAF-microtask");
})
});
const transition = await new Promise(resolve => addEventListener('pagereveal', event => {
sequence.push("pagereveal");
assert_true("viewTransition" in event, "PageRevealEvent should have a viewTransition");
assert_not_equals(event.viewTransition, null, "PageRevealEvent should have a non-null viewTransition");
event.viewTransition.ready.then(() => {
sequence.push("ready");
});
event.viewTransition.updateCallbackDone.then(() => {
sequence.push("updateCallbackDone");
});
resolve(event.viewTransition);
}));
await transition.finished;
sequence.push("finished");
assert_array_equals(sequence, ["pagereveal", "updateCallbackDone", "ready", "rAF", "rAF-microtask", "finished"]);
});
}
</script>
<style>
@view-transition {
navigation: auto;
}
</style>
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