Roger Johansson notes that HTML 5 compliant browsers will treat all content served as
text/html with the HTML 5 specification. And this means that all of today’s HTML and most of XHTML will be HTML 5. Of course, this is what W3C wants. Usually the browser and web development vendors have something else in mind. They are too busy with their own runtimes to comply with the W3C specifications. At least this time vendors seem to be inline with W3C this time, rather than supporting their own dialects.
Sam Ruby takes a shot at the future and finds the worst case scenario when browsers will be dependent on one closed-source plugin that will render all content. I wonder if it is a good thing that the whole rich internet applications scenario is pushing us away from the standard rendering specification (X/HTML) towards multiple proprietary runtimes influnced by vendors and their businesses. Of course there are some good actions, but they are still lost in the war of formats and market shares.