pjs/layout/reftests/columns/columnrule-basic-ref.html

<div style="position: absolute; top: 20px; left: 517px; width: 6px; background-color: red; height: 100px;"></div>
<div style="position: absolute; top: 20px; left: 20px; -moz-column-count:2; -moz-column-gap: 0px;"><div style="height:200px; width: 500px;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Sed feugiat libero vel diam. Pellentesque pulvinar commodo lacus. Sed fringilla. Sed lectus. Praesent laoreet orci vitae nisi. Duis venenatis tristique massa. Sed commodo diam at mauris.</div></div>