I've started taking an html course and I'm trying to figure out how to add functionality to emacs that exists in programs like atom or brackets. I've seen a few modes web-mode.el and nxhtml mentioned but they don't seem to have the same degree of completion.
Specifically for instance in either atom or brackets you can type for example
<img and a context-popup will give you options for it such as "src= " "alt= " and the complete list of attributes etc. Is there similar autocomplete functionality somewhere?