$ chrome --headless --disable-gpu --repl http://mky.io/random-street-coords/
[0707/092640.194270:INFO:headless_shell.cc(278)] Type a Javascript expression to evaluate or "quit" to exit.
>>> window.COORDS
{"result":{"type":"string","value":"{\"lat\":69.56685225156927,\"lng\":118.69960863143206}"}}