KochiyaOcean/index.html

## index.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
</head>
<body style="height: 100vh; margin: 0;">
  <webview src="https://github.com" style="height: 600px; width: 800px;"></webview>
</body>
</html>

## main.js
var BrowserWindow = require('electron').BrowserWindow;
var app = require('electron').app;
app.commandLine.appendSwitch('disable-site-isolation-trials', true)
app.on('ready', function() {
  var mainWindow;
  mainWindow = new BrowserWindow({
    webPreferences: {
      webviewTag: true,
      nativeWindowOpen: true,
      contextIsolation: false,
    },
  });
  mainWindow.loadURL("file://"+ __dirname + "/index.html");
  mainWindow.openDevTools({detach: true});
  mainWindow.webContents.addListener('new-window', (e, url, frameName, disposition, options, additionalFeatures) => {
    e.preventDefault()
    options = {
      ...options,
      minWidth: 200,
      minHeight: 200,
      webPreferences: {
        webviewTag: true,
      },
    }
    const win = new BrowserWindow(options)
    e.newGuest = win
  })
});

## package.json
{
  "name": "eatable-minister-reason-6ywhd",
  "productName": "eatable-minister-reason-6ywhd",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "kochiyaocean",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "15.3.0"
  }
}

## preload.js
// All of the Node.js APIs are available in the preload process.
// It has the same sandbox as a Chrome extension.
window.addEventListener('DOMContentLoaded', () => {
  const replaceText = (selector, text) => {
    const element = document.getElementById(selector)
    if (element) element.innerText = text
  }

  for (const type of ['chrome', 'node', 'electron']) {
    replaceText(`${type}-version`, process.versions[type])
  }
})

## renderer.js
// This file is required by the index.html file and will
// be executed in the renderer process for that window.
// No Node.js APIs are available in this process because
// `nodeIntegration` is turned off. Use `preload.js` to
// selectively enable features needed in the rendering
// process.

## styles.css
/* Empty */
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	</head>
	<body style="height: 100vh; margin: 0;">
	<webview src="https://github.com" style="height: 600px; width: 800px;"></webview>
	</body>
	</html>
	var BrowserWindow = require('electron').BrowserWindow;
	var app = require('electron').app;
	app.commandLine.appendSwitch('disable-site-isolation-trials', true)
	app.on('ready', function() {
	var mainWindow;
	mainWindow = new BrowserWindow({
	webPreferences: {
	webviewTag: true,
	nativeWindowOpen: true,
	contextIsolation: false,
	},
	});
	mainWindow.loadURL("file://"+ __dirname + "/index.html");
	mainWindow.openDevTools({detach: true});
	mainWindow.webContents.addListener('new-window', (e, url, frameName, disposition, options, additionalFeatures) => {
	e.preventDefault()
	options = {
	...options,
	minWidth: 200,
	minHeight: 200,
	webPreferences: {
	webviewTag: true,
	},
	}
	const win = new BrowserWindow(options)
	e.newGuest = win
	})
	});
	{
	"name": "eatable-minister-reason-6ywhd",
	"productName": "eatable-minister-reason-6ywhd",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "kochiyaocean",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "15.3.0"
	}
	}
	// All of the Node.js APIs are available in the preload process.
	// It has the same sandbox as a Chrome extension.
	window.addEventListener('DOMContentLoaded', () => {
	const replaceText = (selector, text) => {
	const element = document.getElementById(selector)
	if (element) element.innerText = text
	}

	for (const type of ['chrome', 'node', 'electron']) {
	replaceText(`${type}-version`, process.versions[type])
	}
	})
	// This file is required by the index.html file and will
	// be executed in the renderer process for that window.
	// No Node.js APIs are available in this process because
	// `nodeIntegration` is turned off. Use `preload.js` to
	// selectively enable features needed in the rendering
	// process.