Goofy is fluid and XHTML 1.0 Strict but uses tables instead of CSS.

Download Goofy from drupal.org/project/goofy. This version is 6.x-2.x-dev from 2009-Apr-30, a 210.61 KB download.

Two large screen shots increase the download size. A better approach to supplying Drupal themes would be to keep the documentation images online at the theme page in drupal.org and download only the minimal screen shot used in the administration themes list.

Both W3C and TV validate this theme as XHTML 1.0 Strict.

The TV WCAG AA test asks the following question several times. When a theme is moved from tables to CSS, these little images are defined in CSS and do not create problems in the screen readers used by visually impaired people. Cynthia Says asks questions about the same images.
[WAI 1.1 (A), US-508-a] Is the 'alt' text deliberately empty?
<img src="/sites/all/themes/goofy/images/lg-ul.png" class="goofy" alt="" />

Wave detected no accessibility errors.

Cynthia Says it is US 508 and WAI as far as a computer can tell. The report includes many warnings about the alt text for images.
Warning - IMG Element found at Line: nn, Column: nn contains the 'alt' attribute with an empty value. Please verify that this image is only used for spacing or design and has no meaning.

CSS 2.1 and 3 validation produced the same two errors:
W3C CSS Validator results for http://d-theme.com/goofy (CSS level 3)
Sorry! We found the following errors (2)
URI : http://d-theme.com/sites/all/themes/goofy/table.css?k
49 table.goofyo Property cell-padding doesn't exist : 0
50 table.goofyo Property cell-spacing doesn't exist : 0