I put my test site (using Cherry Zen template - thanks for it) through the W3C Validator and the only issue was the 'type' of the search box at the top.

The search box is of type "search" but that is not a permitted type.
If I change includes/functions/extra_functions/search_field_header.php to change the $type parameter of zen_draw_search_field() to 'text' then all is okay.

Quote Originally Posted by W3C Validator Result
Line 95, Column 367: value of attribute "type" cannot be "search"; must be one of "text", "password", "checkbox", "radio", "submit", "reset", "file", "hidden", "image", "button".

…22e397c4a15db3" /><input type="search" name="keyword" size="20" maxlength="30


The value of the attribute is defined to be one of a list of possible values but in the document it contained something that is not allowed for that type of attribute. For instance, the “selected” attribute must be either minimized as “selected” or spelled out in full as “selected="selected"”; a value like “selected="true"” is not allowed.