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

  <style>
  .outer {
    column-count: 2;
    column-fill: auto;
    column-rule: 6px solid black;
    width: 400px;
    height: 110px;
  }
  .inner {
    column-count: 2;
    column-rule: 3px solid green;
    box-sizing: border-box;
    height: 110px;
    background-color: lightgreen;
    border: solid purple;
  }
  .block1 {
    background-color: yellow;
    height: 200px;
  }
  .spanner {
    column-span: all;
    height: 50px;
    background-color: lightblue;
  }
  .block2 {
    background-color: yellow;
    height: 120px;
  }
  </style>

  <article class="outer">
    <article class="inner" style="border-width: 10px 10px 0;">
      <div class="block1">block1</div>
    </article>
    <article class="inner" style="border-width: 0 10px;">
      <div class="spanner">spanner</div>
      <div class="block2">block2</div>
    </article>
    <article class="inner" style="border-width: 0 10px 10px; height:auto;">
      <div class="block2"></div>
    </article>
  </article>
</html>