It's not enough to be stable to be a standard, you also need authority that enforces it. Either because people "respect you" (whatever that means), or because t

It's not enough to be stable to be a standard, you also need authority that enforces it. Either because people "respect you" (whatever that means), or because there's a central authority forcing them to implement the standard, people actually implement it. If they don't, then it's not much of a standard. So, WHATWG is in constant flux, and W3C has about as much authority as I do. _Thankfully_ in practice WHATWG is "stable enough," but just saying that's what "we" consider a good enough standard for something used in creating all sorts of UIs, from trivial to vitally important, is indicative of a bigger problem.