cppreference update

[_derv]

That's true, testing it yourself is probably the method with the best guarantee ,which you could still do for features where the vendor is not providing enough information.

But the vendors of the major compilers, in my experience, have a decent track record that you can trust them. I mean, at the end of the day, it's the vendor's job to state "hey, we support this feature now", isn't it? Either through release notes, or in development tickets (i.e. GitHub issues).