4. Robust Content must be robust enough that it can be interpreted by a wide variety of user
            agents, including assistive technologies. Guideline 4.1 Compatible Understanding Compatible | How to Meet Compatible Maximize compatibility with current and future user agents, including assistive technologies. Success Criterion 4.1.1 Parsing (Obsolete and removed) Understanding Parsing (Obsolete and removed) | How to Meet Parsing (Obsolete and removed) Note This criterion was originally adopted to address problems that assistive technology had directly parsing HTML. Assistive technology no longer has any need to directly parse HTML.