Can you microwave styrofoam?
The Real Answer
It depends on the type. Styrofoam containers labeled 'microwave-safe' have been tested and won't melt or leach harmful chemicals at normal heating temperatures. Regular styrofoam (expanded polystyrene) can warp, melt, or release styrene when heated. If there's no microwave-safe label on the container, transfer your food to a glass or ceramic dish before microwaving.
You're standing in your kitchen holding last night's leftovers in a container you got for free from a restaurant, asking a box that shoots radiation whether it's compatible with the other box made of petroleum foam. This is the peak of modern civilization and nobody's even dressed yet.
Why People Ask This
People ask this at the exact moment they're standing in front of the microwave with takeout in one hand and their phone in the other. It's a question born from hunger plus just enough caution to Google before pressing start — but not enough caution to just use a plate.