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<!doctype HTML>
<head>
<script>
window.parent.postMessage('slow-will-block', '*');
</script>
<script src="slow.js"></script>
<style>
* { margin: 0 }
#target {
background-color: lightBlue;
border: orange 10px solid;
box-sizing: border-box;
}
</style>
<meta name="responsive-embedded-sizing">
</head>
<div id="target" style="width: 100px; height: 400px"></div>