It's pretty generally accepted that the correct way to do web standardization is for proponents of some new thing to implement that thing and deploy it and then once it has been shown to actually work bring a spec to the the standards folks for standardization.
That usually works fairly well, although sometimes if that first pre-standard implementation does too well the original implementor may have trouble replacing theirs with something that follows whatever standard is eventually approved, because there are often significant changes made during the standardization process.
An example of that would be CSS grid layout. That was a Microsoft addition to IE 10, behind a vendor prefix of -ms-. Nearly everyone else liked it and it was standardized but with enough differences from Microsoft's original that you couldn't just remove the -ms- prefixes from your CSS and have it work great with the now standard CSS grid.
It was 4.5 years between the time Microsoft first deployed it in IE 10 and it appearing in other browsers by default (Chrome had it within a year of Microsoft, and Firefox had it about two years after that, but both as an experimental feature the user had the specifically enable). In that 4.5 years enough sites that only cared about IE were using the -ms- form that Microsoft ended up stuck with that on IE 10 and 11 instead of the standard.