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chromium/third_party/blink/web_tests/fast/block/basic/008.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<html lang="en">
 <head>
  <title>CSS Block Box Model: sane horizontal box model and minimum widths</title>
  <style type="text/css">
   .container { width: 5em; }
   .test { margin-left: 0; border-left: none; padding-left: 2em; width: auto; padding-right: 2em; border-right: none; margin-right: 0; }
   .control { margin-left: 0; border-left: none; padding-left: 0; width: 5em; padding-right: 0; border-right: none; margin-right: 0; }
   div { background: navy; height: 1em; }
  </style>
 </head>
 <body>
  <p>The following two DIVs should be the same width (resulting in a single 5 by 2 block).</p>
  <div class="container">
    <div class="test"></div>
  </div>
  <div class="control"></div>
 </body>
</html>