File: multicol-span-all-restyle-004.html

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<!DOCTYPE html>
<html class="reftest-wait">
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test: 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/">
  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
  <link rel="help" href="https://github.com/w3c/csswg-drafts/issues/1072">
  <link rel="match" href="multicol-span-all-restyle-004-ref.html">
  <meta name="assert" content="This test checks change the style of the spanner itself.">

  <script>
  function runTest() {
    document.body.offsetHeight; // flush layout

    var spanner = document.getElementById("spanner");
    spanner.style.backgroundColor = "yellow";

    document.documentElement.removeAttribute("class");
  }
  </script>

  <style>
  #column {
    column-count: 1;
    width: 400px;
    outline: 1px solid black;
  }
  h3 {
    column-span: all;
  }
  </style>

  <body onload="runTest();">
    <article id="column">
      <div>
        <div>block1</div>
        <h3 id="spanner">yellow spanner</h3>
        <div>block2</div>
      </div>
    </article>
  </body>
</html>