Earlier quoted context omitted.
> The WHATWG has always opposed the W3C's spec. They see it as confusing to have two "official" specifications. The WHATWG has not always opposed the W3C's spec. The WHATWG explicitly agreed to work with the W3C to form an edited, snapshot spec based on the WHATWG spec. That's what HTML5 was supposed to be. However, the W3C process then hijacked this, by dropping things from the WHATWG spec, adding things back that h…
> W3C process then hijacked this While I agree the W3C's insistence on maintaining a parallel spec. is a silly idea they should absolutely abandon, I fail to see how any but the most biased perspective could conclude that they are "hijacking" a process of their own. W3C haven't dropped anything from the WHATWG spec.: that's separate and out of their control. They can drop what they like from their copy, it's their co…
If the W3C spec is a snapshot, possibly of a subset, possibly with some editorial but not functional changes, then reconciling the specs is useful; it gives you want the W3C wants to provide, versioned, frozen specifications that can be used as the basis for other specs, for people to claim "full conformance" with a particular version, and so on.
Or, if the W3C process identifies real issues, then it should work with the WHATWG community to resolve those issues; since the WHATWG spec is being used as the upstream, evolving spec that these snapshots are being made from, it makes the most sense to get the changes into the upstream first, so you don't have to resolve the issues every time or maintain divergence forever.
However, the W3C instead just insisted on writing the spec the way it wanted, without regards to whether it would actually be implemented.
It makes no sense to publish a spec that will never be implemented by any of the projects that actually have real-world implementations, and differs from the spec that the implementers actually use. That just causes confusion.
So yes, they hijacked the process in the sense that the WHATWG agreed to work together with the W3C, but the W3C never really worked in good faith to resolve differences or provide technical arguments for their changes.