min-width-ref.html

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<!DOCTYPE html>

<html>

  <body>

    <style>

      #a { border: 1px solid green; width: 150px; height: 200px; }

      #b { border: 1px solid black; min-width: 200px; height: 100px; }

    </style>

    <div id="a">

      <div id="b">

      </div>

    </div>

  </body>

</html>