The online coin flip uses browser-generated randomness to return heads or tails and keeps a short history of recent flips. It is a fast substitute for a physical coin when two outcomes should have the same probability.
Choose who starts a game, Break a simple tie, Run a probability demonstration, and Make a harmless yes-or-no choice
Decide what heads and tails mean before flipping so the interpretation cannot change after the result. A coin flip is appropriate for equivalent low-stakes options, not decisions that need analysis or consent.