Generally you should only concern yourself with the document.documentElement.clientWidth/clientHeight... as you really don't have any control over much else.
You may want to use the window.innerWidth/innerHeight if you intend to override scrolling behavior, setting html overflow to hidden, and your own scrolling regions.
The use of other information is mostly going to only help you in terms of knowing what *could* be used for full-screen interaction (F11 mode) if you're doing gaming/simulation work.
tracker1 1614 days ago. link 1 point ▲ ▼