W3C process dictates that two implementations exist, not that all major browsers implement the whole standard. Thus, a W3C fork of the standard is of no practic

W3C process dictates that two implementations exist, not that all major browsers implement the whole standard. Thus, a W3C fork of the standard is of no practical use to “conservative app developers”. If you need to target specific (probably legacy) browsers, you check caniuse.com. By the way, the WHATWG HTML standard integrates little boxes with caniuse.com data. That is indeed useful to developers.