It's not a standard, but I can tell you that tech innovators do not stand around and wait for some committee to decide "Oh yea, uhh lets make HTML5 the standard

It's not a standard, but I can tell you that tech innovators do not stand around and wait for some committee to decide "Oh yea, uhh lets make HTML5 the standard now". No matter what the standards say, any respectable web browser should be making their best effort to "conform" to the latest technology.