According to the WHATWG blog, future versions of the HTML specification will no longer use a version number. I can't imagine why this is a good idea. How are web designers supposed to know how to target their sites to visitors? A "living and breathing spec" will require frequent updates from every browser vendor, so as to stay current with what's allowed. As new features are implemented, how will developers know who's compliant and who's not? It seems to me that removing the version is a big step backwards. Perhaps they have ways of handling these situations?