css/css-multicol/multicol-containing-001.xht

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<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>CSS Multi-column Layout Test: a column box can not act as containing block for elements with 'position: absolute'</title>
  <link rel="author" title="Opera Software ASA" href="http://www.opera.com/" />
  <link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> <!-- 2013-07-27 -->
  <link rel="help" href="http://www.w3.org/TR/css3-multicol/#the-multi-column-model" title="2. The multi-column model" />
  <link rel="match" href="multicol-containing-001-ref.xht"/>
  <meta name="flags" content="ahem" />
  <meta name="assert" content="This test checks that a column box does not establish containing block for elements with 'position: absolute'." />
  <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
  <style type="text/css"><![CDATA[
  div
  {
  background-color: yellow;
  border: gray solid 1em;
  color: black;
  font: 1.25em/1 Ahem;
  orphans: 1;
  widows: 1;
  width: 12em;

  column-count: 3;
  column-gap: 0;
  }

  span
  {
  color: red;
  position: absolute;
  top: -1em;
  }

  /*
  In this test, the initial containing block establishes containing block
  for such red span. Therefore, the 2 short red stripes should be
  positioned out of view, just outside the top edge of viewport.
  */

  ]]></style>
 </head>
 <body>
  <div>
  bl ac
  <span>re dd</span>
  bl ac
  bl ac
  </div>
 </body>
</html>