This question already has an answer here:
I just accidentally scrolled the size in my browser (FF24.2.0) and I noticed that the graphics in the stack exchange network (meta, se, android, code golf as far as I can see at least) don't scale and get blurry instead.
I hope you can see the difference, if not try it for yourself (ctrl + scroll in most browsers). Even the
downvote arrows get a bit blurry. I am an absolute beginner on the topics of graphics and I would not know the first thing about how to change this stuff, but I wanted to share my confusion.
Is there a particular reason this is not implemented? Is it just not possible? Or has this been answered before and I simply did not find it trough search?