This is something that would be very convenient. However, like most everything else related to web browsers, you constantly have to deal with backwards computa

This is something that would be very convenient. However, like most everything else related to web browsers, you constantly have to deal with backwards computability across multiple browsers. So this is just going to end up being ONE more thing that CSS coders have to be aware of. Hurray for CSS variable adoption being available to 90% of browsers in 2015!