Comparison Between Section 508 and WCAG 1.0 Priorities

Section 508 is a hybrid of A, AA and AAA guidelines. Priority level appears in parenthesis after 508 requirement:

• Text equivalent for images (A)
• Synchronized multimedia captioning (A)
• Information not color dependant (A)
• Readable without style sheet (A)
• Redundant text links for image maps (A)
• Client-side image maps (A)
• Row and column headers for data tables (A)
• Associate data with headers in complex tables (A)
• Title frames with text (A)
• No page flicker (A)
• A text-only version only when no alternative (A)
• Accessible alternative to scripting (A)
• Links to accessible plug-ins or applets (AA)
• Make forms accessible (AA)
• Ability to skip repetitive navigation links(AAA)
• Notification of timed response and ability to notify if more time is needed (not in WCAG 1.0 Guidelines)

For more details, see Jim Thatcher's excellent comparison (http://www.jimthatcher.com/sidebyside.htm#WCAGView).