[netcan]

I like it. Something users can intuitively understand. Even if they need to be directed to it to find out.

"You need a browser that supports Web 2010 or higher to use this app."

On the other side, it would help users pressure webapp developers that aren't supporting their specific device / OS version.

"My browser is 2014. Why isn't this working." would be hard for customer service to BS around.

THe downside is that even if most of the browsers being used support some 2015 feature now, it would be hard to justify using it in 2013.