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<html>
<head>
<style>
div { background: red; height: 3em; }
div:empty { background: lime; }
</style>
</head>
<body>
<div style="display: none"></div>
<script>
var div = document.getElementsByTagName("div")[0];
div.appendChild(document.createTextNode(""));
div.style.display = "";
</script>
</body>
</html>
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