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<!DOCTYPE html>
<html id=r class=f>
<head>
<style>
.f { position: fixed; background: #eee }
#part { position: absolute; left: 50px; top: 50px; width: 50px; height: 50px;
padding: 5px; view-transition-name: p; background: #acf; }
</style>
</head>
<body>
<div id=part>A</div>
</body>
</html>