Will UAs be able to present an API to (X)HTML documents that conforms to both the W3C DOM and the WHATWG's HTML5 DOM?
If XHTML2 uses a different namespace from XHTML1, will UAs be able to treat XHTML1 documents in a way that conforms to both W3C and WHATWG specs? If XHTML2 ends up using the same namespace as XHTML1, will UAs be able to treat XHTML2 documents in a way that conforms to both W3C and WHATWG specs? Would there be any overlap, where elements from HTML5 and XHTML 2.0 with different names perform the same function? In each question I'm including all current working drafts but excluding any future work. If there are any incompatibilities, what are they?
