You have a (very common) mistaken view of what the W3C is and how it works. It is NOT an independent standards body that tells browser makers what to do! In fact, it's the exact opposite: the browser makers (and Google is a big one) tell the W3C what to do.
This makes perfect sense if you think about it, because the browser makers ultimately decide what goes into the browser. If the W3C was "in charge" and tried to make Google (or another browser maker) do anything, Google could simply ignore them. That system wouldn't last.
It has to work this way ... and Google (along with Apple, Microsoft, etc.) have decided this syntax is best for them (and possibly their users).
This makes perfect sense if you think about it, because the browser makers ultimately decide what goes into the browser. If the W3C was "in charge" and tried to make Google (or another browser maker) do anything, Google could simply ignore them. That system wouldn't last.
It has to work this way ... and Google (along with Apple, Microsoft, etc.) have decided this syntax is best for them (and possibly their users).