3.1 - When an appropriate markup language exists, use markup rather than images to convey information. Priority 2
3.2 - Create documents that validate to published formal grammars. Priority 2
3.3 - Use style sheets to control layout and presentation. Priority 2
3.4 - Use relative rather than absolute units in markup language attribute values and style sheet property values. Priority 2
3.5 - Use header elements to convey document structure and use them according to specification. Priority 2
3.6 - Mark up lists and list items properly. Priority 2
3.7 - Mark up quotations. Do not use quotation markup for formatting effects such as indentation. Priority 2
Chuck Letourneau & Geoff Freed