Sites must have satisfied the following Priority 1 WAI Guidelines.
1.1 Provide a text equivalent for every non-text element.
1.2 Provide redundant text links for each active region of a server-side image map.
1.3 Until user agents can automatically read aloud the text equivalent of a visual track, provide an auditory description of the important information of the visual track of a multimedia presentation.
1.4 For any time-based multimedia presentation (e.g., a movie or animation), synchronize equivalent alternatives (e.g., captions or auditory descriptions of the visual track) with the presentation.
2.1 Ensure that all information conveyed with colour is also available without colour, for example from context or markup.
4.1 Clearly identify changes in the natural language of a document's text and any text equivalents (e.g., captions).
5.1 For data tables, identify row and column headers.
5.2 For data tables that have two or more logical levels of row or column headers, use markup to associate data cells and header cells.
6.1 Organize documents so they may be read without style sheets.
6.2 Ensure that equivalents for dynamic content are updated when the dynamic content changes.
6.3 Ensure that pages are usable when scripts, applets, or other programmatic objects are turned off or not supported. If this is not possible, provide equivalent information on an alternative accessible page.
7.1 Until user agents allow users to control flickering, avoid causing the screen to flicker.
8.1 Make programmatic elements such as scripts and applets directly accessible or compatible with assistive technologies [Priority 1 if functionality is important and not presented elsewhere, otherwise Priority 2.]
9.1 Provide client-side image maps instead of server-side image maps except where the regions cannot be defined with an available geometric shape.
11.4 If, after best efforts, you cannot create an accessible page, provide a link to an alternative page that uses W3C technologies, is accessible, has equivalent information (or functionality), and is updated as often as the inaccessible (original) page.
12.1 Title each frame to facilitate frame identification and navigation.
14.1 Use the clearest and simplest language appropriate for a site's content.
Document last modified: 2010/01/03 . Content in this portal is modified daily by a community of providers.