Q: Why aren't the games loading? / White or Grey Box
A: Schools might be blocking the code for some of these games, or they could be blocking an emulator.
Q: Why isn't WebGL Working?
A: I haven't really looked into this topic, but I heard that you have to enable WebGL on your browser for any games to work, if this doesn't work, you should look up some tutorials.
Q: Why are the games SUPER Laggy?
A: My Guess is that since you are on a School Computer / Chromebook the Hardware might not be as good as a Normal Gaming PC.