The problem is that the standard is fucking huge and maybe your browser supports every feature of version 5xx but is missing a feature related to authentication using guinea pigs introduced in v369. So it would only be allowed to advertise compatibility with v368 even though it can do everything except Guinea pigs.
Realistically you would trim the standard to a core set and advertise compatibility with a version of that and then advertise optional extensions. And that’s optional bits if you ask me.
The problem is that the standard is fucking huge and maybe your browser supports every feature of version 5xx but is missing a feature related to authentication using guinea pigs introduced in v369. So it would only be allowed to advertise compatibility with v368 even though it can do everything except Guinea pigs.
Realistically you would trim the standard to a core set and advertise compatibility with a version of that and then advertise optional extensions. And that’s optional bits if you ask me.
A standard is that, a standard. The amount of moving parts (features?) is irrelevant.
Either it’s up to the standard or it isn’t.
Then no browser will be “up to” the last 15 years of the standard as none implement all features.
Correct. That is why we’re talking about having standards and enforcing them. That’s the whole point.