Web Style Guide. Web Accessibility Initiative (WAI) - home page. Authoring Tool Accessibility Guidelines (ATAG) 2.0 is a Proposed Recommendation Authoring Tool Accessibility Guidelines (ATAG) 2.0 was published today as a Proposed Recommendation. ATAG 2.0 provides guidelines for designing web content authoring tools that are both more accessible to authors with disabilities (Part A) and designed to enable, support, and promote the production of more accessible web content by all authors (Part B). ATAG is described in the ATAG Overview.