HTML Tidy accessibility-check 1.0/1.1.12

This file demonstrates a case where ascii art is present, but no description is found.

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>alert 1.0/1.1.12</title>
</head>
<body>     
<p>previous previous text</p>
<p>previous text</p>
<pre>
  %   __ __ __ __ __ __ __ __ __ __ __ __ __ __
100 |             *                             |
 90 |                *  *                       |
 80 |          *           *                    |
 70 |             @           *                 |
 60 |          @                 *              |
 50 |       *        @              *           |
 40 |                   @              *        |
 30 |    *  @              @  @           *     |
 20 |                                           |
 10 |    @                       @  @  @  @     |
      0  5 10 15 20 25 30 35 40 45 50 55 60 65 70
      Flash frequency (Hertz)
</pre>
<p>following text</p>
<p>following following text</p>
</body>
</html>