Properties such as the title attribute can be used as an accessible name when other properties are not present -- this and other properties are sometimes considered fallback content --e.g. providing a name as a last resort rather than the most appropriate way to provide an accessible name.  It would be helpful to indicate which properties are "fallback" to assist people determining what is sufficient or not for conformance claims.  For example, a conformance claim often may not be met through relying on fallback content.