main.js

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

function createWindow () {
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      preload: __dirname + '/preload.js',
      sandbox: true
    }
  })

  ipcMain.on('is-accessible', (ev) => {
	  ev.returnValue = app.isAccessibilitySupportEnabled()
  })

  mainWindow.loadURL('https://vscode-web-test-playground.azurewebsites.net/?enter=true')
}

app.on('ready', createWindow)

app.on('window-all-closed', function () {
  app.quit()
})

package.json

{
  "name": "electron-accessibility-test",
  "version": "1.0.0",
  "description": "A minimal Electron application",
  "main": "main.js"
}

preload.js

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

window.isAccessible = () => {
    return ipcRenderer.sendSync('is-accessible');
}