How can I save date in one game to load it in another?

Saving and loading a game state of a WebGL game is fine but Saving from one WebGL game and loading from a another has proven quite a task. Is this actually possible?

A bit more info:
I want user A to save data from WebGL game G1 and load the same data in WebGL game G2. No server or other computer would be aware of that. Only user A.