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pagereveal-microtask-sequence.html
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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>
<linkrel="help" href="https://drafts.csswg.org/css-view-transitions-2/">
<scriptsrc="/resources/testharness.js"></script>
<scriptsrc="/resources/testharnessreport.js"></script>
<script>
constparams=newURLSearchParams(location.search);
switch(params.get("mode")||"test"){
case"test":
promise_test(asynct=>{
constsequence=awaitnewPromise(resolve=>{
window.test_finished=s=>{resolve(s)};
constpopup=window.open("?mode=old");
t.add_cleanup(()=>popup.close());
});
assert_array_equals(sequence,["pagereveal","updateCallbackDone","ready","rAF","rAF-microtask","finished"]);
});
break;
case"old":
onload=()=>requestAnimationFrame(()=>requestAnimationFrame(()=>{
location.replace('?mode=new');
}));
break;
case"new":
constsequence=[];
requestAnimationFrame(()=>{
sequence.push("rAF");
Promise.resolve().then(()=>{
sequence.push("rAF-microtask");
});
});
addEventListener('pagereveal',event=>{
sequence.push("pagereveal");
event.viewTransition.ready.then(()=>{
sequence.push("ready");
});
event.viewTransition.updateCallbackDone.then(()=>{
sequence.push("updateCallbackDone");
});
event.viewTransition.finished.then(()=>{
sequence.push("finished");
window.opener.test_finished(sequence);
});
});
}
</script>
<style>
@view-transition {
navigation: auto;
}
</style>
