css/css-multicol/column-height-009-ref.html

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
  .item {
    display: block;
    width: 50px;
    height: 40px;
    margin-bottom: 20px;
    background: cyan;
  }
  .column {
    float: left;
    width: 100px;
  }
  .rule {
    float: left;
    width: 2px;
    margin-left: 9px;
    margin-right: 9px;
    background: black;
  }
</style>
<div style="width:340px; height:160px; line-height:20px; background:yellow;">
  <div class="column">
    <div class="item">a<br>b</div>
    <div class="item">g<br>h</div>
    <div class="item">m<br>n</div>
  </div>
  <div class="rule" style="height:160px;"></div>
  <div class="column">
    <div class="item">c<br>d</div>
    <div class="item">i<br>j</div>
    <div class="item">o<br>p</div>
  </div>
  <div class="rule" style="height:160px;"></div>
  <div class="column">
    <div class="item">e<br>f</div>
    <div class="item">k<br>l</div>
  </div>
</div>