One of my pet peeves in the modern web is when someone displays an image and scales it to exactly the size of your screen, but I want to look more closely at a part of the image so I do a scrollwheel zoom, only for the image to actually shrink as every UI element except the thing I want gets bigger. And then you go "ok, right click on the image and do the "Open Image in new tab" thing and somehow the site defeats that and puts all of their UI crap in the new tab as well.