rder-bottom-width
  +
      0px : margin-bottom
  +
     80px : bottom
    =====================
    320px : height of containing block

And so computed height value must be 80px .
*/

  ]]></style>

 </head>

 <body>

  <p><img src="support/pass-cdts-abs-pos-non-replaced.png" width="246" height="36" alt="Image download support must be enabled" /></p>

  <div id="containing-block">1 2 34<span></span></div>

 </body>
</html>