<!DOCTYPE html>
<style>
div {
-moz-column-count: 3;
-moz-column-gap: 8px;
-moz-column-rule: thick solid red;
visibility: hidden;
width: 300px;
background-color: #fcc;
}
span {
visibility: visible;
}
</style>
<div>
<span>This is some content that is still shown within the columns.</span>
</div>