Checkpoints for Guideline
11. Use W3C technologies and guidelines.

11.1 - Use W3C technologies when they are available and appropriate for a task and use the latest versions when they are supported.  Priority 2 

11.2 - Avoid deprecated features of W3C technologies.  Priority 2 

11.3 - Provide information so that users may receive documents according to their preferences.  Priority 3 

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.  Priority 1