using the examples listed as being needed (like swing and flex), it would seem that they meant a visual components library that has "everything" needed for an a

using the examples listed as being needed (like swing and flex), it would seem that they meant a visual components library that has "everything" needed for an app. The "DOM" in this case is referring to the basic elements of a html page. It's like bricks, for which an app UI could be built, but it will be different for every app (both visually, as well as code-wise). The thesis in the poster's remarks is that there should've been a common application GUI library for the web.