I just installed a new theme on my site, working to get it ready for use on another site. In doing so, I added cForms 5.3, then, after I had almost everything installed (plugins) and the theme tweaked to how I wanted it for the other site, I ran everything through validation.

The xHTML and CSS validation reported several errors in cForms. A few were corrected by fixing a double semi-colon in the "linklove" item, specifically:

.linklove {
       margin:0 0 10px 0!important;
     
 padding:0!important;

       text-align:center!important;;

The other problem, which was present in each of the CSS style available by default in cForms is the specifying of:

 

display: -moz-inline-block;

 

After researching it, I found in the Web Standards Group list archive that even some at Mozilla want that code to disappear because it is problematic. It looks like the following should be used instead of the above call:

display: inline-block

Once I made the change to the code, I ran the pages back through both validators at W3C and everything validated just fine.