electron/docs/fiddles/menus/customize-menus/renderer.js

const { ipcRenderer, shell } = require('electron')

// Tell main process to show the menu when demo button is clicked
const contextMenuBtn = document.getElementById('context-menu')

contextMenuBtn.addEventListener('click', () => {
  ipcRenderer.send('show-context-menu')
})

const links = document.querySelectorAll('a[href]')

for (const link of links) {
  const url = link.getAttribute('href')
  if (url.indexOf('http') === 0) {
    link.addEventListener('click', (e) => {
      e.preventDefault()
      shell.openExternal(url)
    })
  }
}