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Test Info:
<!DOCTYPE HTML>
<html>
<head>
<style>
body { white-space:pre; color:black; }
#inner::first-letter { color:lime; }
</style>
</head>
<body><div id="inner"><span id="s">
</span>AB</div></body>
<script>
document.body.offsetTop;
document.getElementById("s").firstChild.data = "";
</script>
</html>