ckerr/index.html

## index.html
<!DOCTYPE html>
<html>

<body>
  <button id="b">Open window</button>
  <script src="./renderer.js"></script>
</body>

</html>

## main.js
const { app, BrowserWindow } = require('electron')

function createWindow() {
  const mainWindow = new BrowserWindow({
    webPreferences: {
      nodeIntegration: true,
      nativeWindowOpen: true
    }
  })

  mainWindow.loadFile('index.html')

  mainWindow.webContents.on("new-window", (e, url, f, d, op) => {
    console.log(op.title);
  })
}

app.whenReady().then(() => {
  createWindow()
})

app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

## renderer.js
document.getElementById("b").onclick = () => {
    window.open("https://google.com", "aaa");
};
	<!DOCTYPE html>
	<html>

	<body>
	<button id="b">Open window</button>
	<script src="./renderer.js"></script>
	</body>

	</html>
	const { app, BrowserWindow } = require('electron')

	function createWindow() {
	const mainWindow = new BrowserWindow({
	webPreferences: {
	nodeIntegration: true,
	nativeWindowOpen: true
	}
	})

	mainWindow.loadFile('index.html')

	mainWindow.webContents.on("new-window", (e, url, f, d, op) => {
	console.log(op.title);
	})
	}

	app.whenReady().then(() => {
	createWindow()
	})

	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})
	document.getElementById("b").onclick = () => {
	window.open("https://google.com", "aaa");
	};