[Commentor] LC-441 Al Gilman on behalf of WAI [Working Group decision] Out of scope since we are not addressing user agents in the document. But after further discussion with the WAI CG, we have added an appendix (Appendix B, Related Reading) linking to the existing WAI Guidelines and Techniques. [Commentor reply] yes [Comment] 
5.4.3 Structural Elements should reference UAAG 10.4 Provide outline view (P2) - 1. Make available to the user an "outline" view of rendered content, composed of labels for important structural elements (e.g., heading text, table titles, form titles, and other labels that are part of the content).