File: margin-collapse-129.xht

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>CSS Test: Margin Collapsing: negative margins (easy)</title>
  <link rel="author" title="Ian Hickson" href="mailto:ian@hixie.ch"/>
  <link rel="alternate" href="http://www.hixie.ch/tests/adhoc/css/box/block/margin-collapse/029.html" type="text/html"/>
  <link rel="help" href="http://www.w3.org/TR/CSS21/box.html#collapsing-margins"/>
  <style type="text/css">
   .container { background: red; height: auto; border: 1em lime solid; }
   .a { margin-top: -1em; margin-bottom: 1em; }
   .b { margin-top: 1em; margin-bottom: 1em; }
   .c { margin-top: 1em; margin-bottom: 1em; }
   .d { margin-top: 1em; margin-bottom: 1em; }
   .e { margin-top: 1em; margin-bottom: 1em; }
   .f { margin-top: 1em; margin-bottom: 1em; }
  </style>
 </head>
 <body>
  <p>There should be no red below.</p>
  <div class="container">
   <div class="a">
    <div class="b"> </div>
    <div class="c"> </div>
   </div>
   <div class="d">
    <div class="e"> </div>
    <div class="f"> </div>
   </div>
  </div>


</body>
</html>