Electron Fiddle Gist

index.html

<!-- Empty -->

main.js

const {app, BrowserWindow, BrowserView} = require('electron')

const APPLY_BROWSER_VIEW_FIX = false;

function createWindow () {
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600
  })

  const mainView = new BrowserView({
    webPreferences: {
      nodeIntegration: false,
      contextIsolation: true,
    },
  });

  mainWindow.setBrowserView(mainView);
  mainView.setBounds({
    x: 0,
    y: 0,
    width: 800,
    height: 600,
  });

  mainView.webContents.loadFile('index.html')

  if(APPLY_BROWSER_VIEW_FIX) {
    app.on("before-quit", () => {
      mainWindow.setBrowserView(null);
    });
  }
}

app.whenReady().then(createWindow)

preload.js

// const { contextBridge } = require("electron");

// class DUJK {
//   constructor(f) {
//     this.f = f;
//   }
// }

// let g_fn = null

// contextBridge.exposeInMainWorld("test", {
//   // Listen for messages
//   on: (fn) => g_fn = new DUJK(fn),
// });

for (let i = 0; i < 10; i++) {
  setInterval(() => {
    (() => {})(function() {})
  }, 1)
}

renderer.js

// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// All of the Node.js APIs are available in this process.

styles.css

/* Empty */