Zarel/Pokemon-Showdown — comment on commit 37e19022c0858d2f624a957c7568535ed51889de
File: README.md line 39
By l1bbcsg:

It seems there's something wrong with socket.io. On Opera, script fails with Undefined variable "io" when you initiate connection to actual server. Substituting your socket.io script advanced me to bug report alert, but that's it, nothing happens after that .