[azangru]

> It would be very challenging nowadays to both be a great UX designer and be current with the latest CSS evolutions.

Designers are supposed to be fluent in the medium they are designing for. Without understanding what's possible, what's easy, what's hard, what squeezes and what scales, or what's going to have a negative impact on site performance, how can one be a great designer?

[alwaysbeconsing]

Designers should be very familiar with the standard widgets, idioms, and interactions of the platforms they're designing for, but I don't think performance is rightfully something they should have to worry about.

[azangru]

> but I don't think performance is rightfully something they should have to worry about

But then I, as a developer, have to argue with the designer why a table containing a thousand rows or more, with no pagination, may not be a good idea :-(

[emehex]

I think a good designer polls his dev team to help him figure out what’s a “big lift” and whats easy. And a good developer works with her designer to point out “big lifts” and helps find compromises!