Still, JS and CSS can be combined in novel ways to provide new experiences or new ways of doing old things. Plus there are new capabilities coming to JS all the

Still, JS and CSS can be combined in novel ways to provide new experiences or new ways of doing old things. Plus there are new capabilities coming to JS all the time, things that literally weren't possible to do before. And smartphones and tablets are still somewhat new. So, OK, you can be an expert in building a website for desktop browsers. But that's about it.