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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
#div:first-letter { color: green; }
</style>
</head>
<body onload="document.getElementById('div').appendChild(document.createTextNode(''));">
<div style="column-width: 0.5em; column-gap: 100px;" id="div">xx ! </div>
</body>
</html>