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<!doctype html>
<style>
div {
width: 100px;
height: 100px;
background: green;
}
html { height: 50%; }
::view-transition-group(*) { animation-duration: 500s }
</style>
<div></div>
<script>
function run() {
document.startViewTransition(() => {
requestAnimationFrame(() => requestAnimationFrame(() => {
window.parent.postMessage({}, "*");
}));
});
}
onload = () => requestAnimationFrame(() => requestAnimationFrame(run));
</script>