The W3C's HTML standard is a buggy, outdated copy of the upstream WHATWG standard. In the copy-and-paste process the W3C regularly introduces errors which prev

The W3C's HTML standard is a buggy, outdated copy of the upstream WHATWG standard. In the copy-and-paste process the W3C regularly introduces errors which prevent the W3C copy from being used as an implementation reference, even as an outdated standard. Example: https://github.com/w3c/webauthn/issues/257 https://github.com/w3c/webauthn/issues/257 So the W3C copy is not authoritative, nor can it be in its current state, regardless of what the EU or anyone else says. The WHATWG standards are the authoritative implementation references. The W3C specs are buggy, outdated, incomplete copies and that looks unlikely to change for HTML, DOM or any other specs the W3C takes from WHATWG and republishes with the W3C logo.