Of course it's hard. I think being fluent in all of those techs is unlikely. I've seen too many back-end programmers who think they know js and css; they under

Of course it's hard. I think being fluent in all of those techs is unlikely. I've seen too many back-end programmers who think they know js and css; they understand most of the syntax, but not the patterns in place, what wheels exist already, what libraries to use, or the quirks in the current implementations. Some don't really know the DOM, others don't really understand cascading. Sure they can make something that looks good in the latest Firefox, but when you open it in IE 6 or 7 you're screwed. Example: Did you know you can't have a JavaScript variable that shares a name with a form element? Do you know why?