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<!DOCTYPE html>
<title>New page: reports whether its pagereveal carried a view transition</title>
<style>
@view-transition { navigation: auto; }
</style>
<script>
addEventListener('pagereveal', e => {
window.opener.postMessage(
'pagereveal:' + (e.viewTransition ? 'transition' : 'null'), '*');
});
</script>
<div style="width: 100px; height: 100px; background: blue"></div>