<!DOCTYPE html>

  <meta charset="UTF-8">

  <title>CSS Reftest Reference</title>

  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">

  <style>
  div
    {
      height: 100px;
      position: relative;
      width: 100px;
    }

  div#outer-black
    {
      background-color: black;
      left: 90px;
      top: 90px;
    }

  div#middle-orange
    {
      background-color: orange;
      bottom: 30px;
      right: 30px;
    }

  div#inner-blue
    {
      background-color: blue;
      bottom: 30px;
      right: 30px;
    }
  </style>

  <p>Test passes if a blue box overlaps an orange box, which overlaps a black box.

  <div id="outer-black">

    <div id="middle-orange">

      <div id="inner-blue"></div>

    </div>

  </div>
