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<!DOCTYPE html>
<html>
<title>View transitions: promise resolution ordering</title>
<link rel="help" href="https://github.com/WICG/view-transitions">
<link rel="author" href="mailto:vmpstr@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
width: 100px;
height: 100px;
background: blue;
contain: paint;
view-transition-name: target;
}
.green {
background: green;
}
</style>
<div id=target></div>
<script>
promise_test(async t => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
return new Promise((resolve, reject) => {
let dom_change_ran = false;
let transition = document.startViewTransition(() => {
target.classList.add("green");
dom_change_ran = true;
});
let dom_updated_resolved = false;
transition.updateCallbackDone.then(() => {
if (!dom_change_ran)
reject();
// If there's a rAF before ready resolves, we fail.
requestAnimationFrame(reject);
dom_updated_resolved = true;
});
transition.ready.then(() => {
if (!dom_updated_resolved)
reject();
resolve();
});
});
}, "updateCallbackDone resolves, then ready resolves with no rAF in between");
</script>
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