I need to create a quick and basic user interface standards doc for a web-based application. It would have information such as field and font sizes, alignments, use a sortable table when, use a drop-down list when, colors, graphical standards, etc. I don't want to re-invent the wheel and would like to leverage existing, modern web-based UI, and make sure that it fits in with other DNN modules and development.

Does anyone know of an existing document or source for me to start with? Again, I don't want to have to write this from scratch and would rather leverage some existing and established standards. One that lays out the standards simply and directly (no tangents on why users need drop-downs or the theory of radio buttons) and has screen shots would be preferable.