Electron. Load external website and access electron main process

Sorry for possible duplicate. Is it possible in electron to load external website and access main process from website?

My flow:

• Open URL inside electron window:

  mainWindow.loadURL("http://localhost:80/");

• Inside my index.html, which will be downloaded from http://localhost:80/ I want to execute something like that require('remote').remote

But when i actually try to do that, browsers console throws this error

Uncaught TypeError: fs.existsSync is not a function

How can i run scripts written for electron inside browser page, which was loaded from electron ?

via blckt