+<body style="overflow: hidden;">
<div style="-moz-column-width:300px; -webkit-column-width:300px; column-width:300px; column-fill:auto; border:2px solid black; height:400px">
This is some text.<br>
This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>
Longer text designed to test float and wrapping behavior.
</span>
</div>
+</body>