Won't working on Web Worker

[L2NE-dev]

I tried to implement it in web workers... Probably, all was in vain. Why? Because of you preferred to use iframe and window as globals. I tried to reassign, but code just stucked.

[ambit-tsai]

Using iframe can easily create a secure isolation environment.
In Web Worker, we need to think of other mechanisms to implement a secure isolation environment.