[JoelSutherland]

Mobile processing power is doubling annually, GPU speed at an even faster rate. Hardware acceleration for CSS transforms is only starting to get good. (No negative values on cubic-bezier timing functions!)

No, web components haven't met native ones yet, but they only need to achieve 60 fps. They will get there, it's a safe bet.

[lurker19]

By the time HTML is as good as native is, native will have moved on to something else, like holograms. Look what happened on the desktop: after 10 years webtech finally became usable as a UI, just in time for everyone to jump to mobile and set performance back another 10 years.