filter-2-ref.xhtml

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    <html lang="en" xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">

    <head>

      <title>Filter sanity-check</title>

      <style type="text/css">

      html, body { margin: 0; background: white; height: 100%; width: 100%; }

      body { position: relative; }

      </style>

    </head>

    <body>

    <div style="position: absolute; top: 50px; left: 10px; width: 100px; height: 10px; background: black"></div>

    <div style="position: absolute; top: 70px; left: 10px; width: 94px; height: 4px; border: 3px solid #000;"></div>

    </body>

    </html>