<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test: 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/">
  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
  <link rel="match" href="multicol-span-all-children-height-002-ref.html">
  <meta name="assert" content="This test checks the percentage height children under multicol container compute the percentage relative to the entire multicol, not just the part after the column-span.">

  <style>
  article {
    column-count: 2;
    width: 400px;
    height: 200px;
    background-color: lightgreen;
    border: 5px solid purple;
  }
  div.block1 {
    background-color: yellow;
    height: 100%; /* Spread evenly into two columns, each 100px. */
  }
  div.spanner {
    column-span: all;
    height: 25%;
    background-color: lightblue;
  }
  div.block2 {
    background-color: yellow;
    /* Column container has only 25% height left, so two extra overflow columns
       are created. Total 4 columns, each 50px. */
    height: 100%;
  }
  </style>

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