<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test Reference: Restyle the column-span itself</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: 1;
    width: 400px;
    outline: 1px solid black;
  }
  h3 {
    column-span: all;
    background-color: yellow;
  }
  </style>

  <body>
    <article id="column">
      <div>
        <div>block1</div>
        <h3>yellow spanner</h3>
        <div>block2</div>
      </div>
    </article>
  </body>
</html>