HTML Tidy accessibility-check 1.0/5.2.1

This file demonstrates a <table> that may require markup (row headers)

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>alert 1.0/5.2.1</title>
</head>
<body>

<table width="80%" border="1" summary="This data table should use markup to associate multiple levels of row and column headers">
    <caption>This data table should use markup to associate multiple levels of row and column headers</caption>

    <tr><th            >System                   </th><td>a-1  </td><td>Susan     </td><td>Macintosh </td></tr>
    <tr><th rowspan="2">ID location<br /> or code</th><td>Local</td><td>Building 1</td><td>Front Desk</td></tr>
    <tr>                                              <td>Local</td><td>Building 2</td><td>Back Desk </td></tr>
    <tr><th            >Required                 </th><td>yes  </td><td>yes       </td><td>no        </td></tr>

</table>

</body>
</html>