<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test: Append a block to an empty inline element</title>
  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">

  <style>
  #column {
    column-count: 3;
    column-rule: 6px solid;
    width: 400px;
    outline: 1px solid black;
  }
  div {
    height: 300px;
    background-color: yellow;
  }
  </style>
  <body>
    <article id="column">
      <span id="span"><div>block</div></span>
    </article>
  </body>
</html>