And for the "I want my site to be displayed in a terminal", there is Lynx and there are guidelines on how to make your site semantic. Again, if people decides to force their users to use JS and stuff, it's THEIR fault. Stop blaming the technology for the misuse of said technology. People can be jackass, we know.
@karolat Well, it depends on what you want to do. The less JS you are required to use, the better. If you can do something with HTML/CSS and avoid the usage of JS, then I'd recommend doing it with HTML/CSS.
The problem is that some sites use JS to display/hide or style elements. That's something that must be avoided.
@mezzodrinker CPU is one thing, yes. But modern computers and even smartphones and tablets can handle it without the user even noticing a thing.