<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<html lang="en">
 <head>
  <title>CSS Block Box Model: overconstrained horizontal box model and minimum widths</title>
  <style type="text/css">
   .container { width: 3em; }
   .test { margin-left: 2em; border-left: none; padding-left: 0; width: auto; padding-right: 0; border-right: none; margin-right: 2em; }
   .control { padding-left: 2em; }
   div { font-size: xx-large; }
  </style>
 </head>
 <body>
  <p>The following two vertical bars should be at the same horizontal position.</p>
  <div class="container">
    <div class="test"><span>|</span></div>
  </div>
  <div class="control"><span>|</span></div>
 </body>
</html>