Most websites have a small default letter size. If I change zoom level with Ctrl++, does it happen entirely on my computer?
I know window size shouldn't be changed for anonymity reasons.
Update due to users comment and clarification:
to be accurate, you asked 2 different questions:
@media
size regarding CSS. See f.ex. stackoverflow.com/questions/22223866/…. it seems as though your comment to tor.stackexchange.com/a/9610/5234 applies as well. :-(