css/css-multicol/multicol-span-all-009.html

<!DOCTYPE html>
<html>
  <meta charset="utf-8">
  <title>CSS Multi-column Layout Test: Test the multicol element is the containing block of absolute elements</title>
  <link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
  <link rel="author" title="Mozilla" href="http://www.mozilla.org/">
  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#the-multi-column-model">
  <link rel="help" href="https://drafts.csswg.org/css-multicol-1/#column-span">
  <link rel="match" href="multicol-span-all-009-ref.html">
  <meta name="assert" content="This test checks the multicol element, not the column boxes divided by column-span, is the containing block of absolute elements.">

  <style>
  article {
    column-count: 3;
    column-rule: 6px solid;
    width: 400px;
    outline: 1px solid black;
    transform: scale(1);
  }
  h3 {
    column-span: all;
    outline: 1px solid blue;
  }
  .out-of-flow {
    position: absolute;
    top: 0;
    right: 0;
  }
  </style>

  <body>
    <article id="column">
      <h3>spanner</h3>
      <div class="out-of-flow">out-of-flow</div>
    </article>
  </body>
</html>