That's literally the W3C standards process!!! W3C standard are supposed to start with a single vendor implementation, then a draft spec, then collaboration and

That's literally the W3C standards process!!! W3C standard are supposed to start with a single vendor implementation, then a draft spec, then collaboration and multiple implementation from other vendors, and THEN a final W3C Standard Specification. The very reason why this spec is not on the standard track is because Mozilla refuses to implement it in Firefox.