best practices: 1. user resizable text fonts 2. user zoomable regions 3. on screen: white on black, default. users can tweak 4. on paper: black on white, de

best practices: 1. user resizable text fonts 2. user zoomable regions 3. on screen: white on black, default. users can tweak 4. on paper: black on white, default. 5. (related to 3 and 4) when looking at a PDF on screen let user see it as white on black, if wishes these are all in my own personal rulebook of software engineering best practices anyway "Kids, get off my lawn."