<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test Reference: Test a multi-column container with percentage height children</title>
  <link rel="author" title="Ting-Yu Lin" href="tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">

  <style>
  article {
    width: 400px;
    height: 200px;
    outline: 1px solid black;
  }
  div {
    height: 25%;
  }
  div.spanner {
    outline: 1px solid blue;
    height: 50%;
  }
  </style>

  <article>
    <div>block1</div>
    <div class="spanner">spanner</div>
    <div>block2</div>
  </article>
</html>