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<!DOCTYPE html>
<meta name="timeout" content="long">
<html>
<title>View transitions: CSS Animations are paused while render-blocked</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:khushalsagar@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@keyframes fade {
from {
opacity: 0;
}
}
div {
width: 100px;
height: 100px;
background: blue;
contain: paint;
view-transition-name: target;
}
.animated {
animation: fade 0.5s;
}
</style>
<div id=target></div>
<script>
let renderBlocked = true;
promise_test(() => {
assert_implements(document.startViewTransition, "Missing document.startViewTransition");
return new Promise(async (resolve, reject) => {
requestAnimationFrame(() => {
document.startViewTransition(() => {
return new Promise(async (inner_resolve) => {
step_timeout(() => {
renderBlocked = false;
inner_resolve();
}, 1000);
});
});
target.classList.toggle("animated");
target.onanimationend = () => {
if (renderBlocked)
reject();
else
resolve();
};
});
});
}, "CSS animation is blocked until prepare callback");
</script>
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