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root stacking context
- LEVEL #1
  - LEVEL #2 (z-index: 1)
    - LEVEL #3
    - ...
    - LEVEL #3
  - LEVEL #2 (z-index: 1)
  - ...
  - LEVEL #2 (z-index: 1)
- LEVEL #1
- ...
- LEVEL #1

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html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
  <head>
    <style type="text/css">
      div {
        font: 12px Arial;
      }

      span.bold {
        font-weight: bold;
      }

      div.lev1 {
        width: 250px;
        height: 70px;
        position: relative;
        border: 2px outset #669966;
        background-color: #ccffcc;
        padding-left: 5px;
      }

      #container1 {
        z-index: 1;
        position: absolute;
        top: 30px;
        left: 75px;
      }

      div.lev2 {
        opacity: 0.9;
        width: 200px;
        height: 60px;
        position: relative;
        border: 2px outset #990000;
        background-color: #ffdddd;
        padding-left: 5px;
      }

      #container2 {
        z-index: 1;
        position: absolute;
        top: 20px;
        left: 110px;
      }

      div.lev3 {
        z-index: 10;
        width: 100px;
        position: relative;
        border: 2px outset #000099;
        background-color: #ddddff;
        padding-left: 5px;
      }
    </style>
  </head>

  <body>
    <br />

    <div class="lev1">
      <span class="bold">LEVEL #1</span>

      <div id="container1">
        <div class="lev2">
          <br /><span class="bold">LEVEL #2</span> <br />z-index: 1;

          <div id="container2">
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
            <div class="lev3"><span class="bold">LEVEL #3</span></div>
          </div>
        </div>

        <div class="lev2">
          <br /><span class="bold">LEVEL #2</span> <br />z-index: 1;
        </div>
      </div>
    </div>

    <div class="lev1">
      <span class="bold">LEVEL #1</span>
    </div>

    <div class="lev1">
      <span class="bold">LEVEL #1</span>
    </div>

    <div class="lev1">
      <span class="bold">LEVEL #1</span>
    </div>
  </body>
</html>