Not sure about browser vendors and their stack. I almost never hear of anyone who develops on a browser vendor's stack, they use 3rd party tools in JS and CSS and webasm etc ... After Node wrapped up the DOM and put a bow on it, it seems that people move on (up? down? sideways?) from webdev at that level (except the people developing alternatives to Node).

I'm not sure if this is the source I used, because the date is a little late, but it seems very thorough and excellent:

http://lapcatsoftware.com/blog/2007/05/16/working-without-a-...