How to tell if your dishes are microwave safe?

Ok so I might be a little bit extra, because most of my dishes say “not microwave safe” on the bottom. Some of my glass dishes that are a bit more artsy extra than classic extra don’t have anything on the bottom tho. How do I know if I can put them in the microwave? I really want a corn dog atm

 

Just put the corndog in the microwave by itself. That's what I do, lol.