line 20 column 3 - Warning: <table> lacks "summary" attribute
Info: Doctype given is "-//W3C//DTD XHTML 1.1//EN"
Info: Document content looks like XHTML 1.1
1 warning, 0 errors were found!

The table summary attribute should be used to describe
the table structure. It is very helpful for people using
non-visual browsers. The scope and headers attributes for
table cells are useful for specifying which headers apply
to each table cell, enabling non-visual browsers to provide
a meaningful context for each cell.

For further advice on how to make your pages accessible
see http://www.w3.org/WAI/GL. You may also want to try
"http://www.cast.org/bobby/" which is a free Web-based
service for checking URLs for accessibility.

To learn more about HTML Tidy see http://tidy.sourceforge.net
Please send bug reports to html-tidy@w3.org
HTML and CSS specifications are available from http://www.w3.org/
Lobby your company to join W3C, see http://www.w3.org/Consortium