javan/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
  </head>
  <body>
    <div style="margin: 20px;">
      <p>
        &lt;webview&gt; visibilityState: <strong id="visibility-state"></strong>
        <button id="update-visibility-state">Update</button>
      </p>

      <webview src="https://electron.atom.io/" style="border: 1px dotted red; width: 100%; height: 400px;"></webview>
    </div>

    <script>
      const reportElement = document.getElementById("visibility-state")
      const buttonElement = document.getElementById("update-visibility-state")
      const webviewElement = document.querySelector("webview")

      function updateVisibilityState() {
        webviewElement.executeJavaScript("(function() { return document.visibilityState })()", true, function(result) {
          reportElement.textContent = result
        })
      }

      webviewElement.addEventListener("dom-ready", updateVisibilityState)
      buttonElement.addEventListener("click", updateVisibilityState)
    </script>

    <!-- All of the Node.js APIs are available in this renderer process. -->
    We are using Node.js <script>document.write(process.versions.node)</script>,
    Chromium <script>document.write(process.versions.chrome)</script>,
    and Electron <script>document.write(process.versions.electron)</script>.
  </body>
</html>

## main.js
const electron = require('electron')
// Module to control application life.
const app = electron.app
// Module to create native browser window.
const BrowserWindow = electron.BrowserWindow

const path = require('path')
const url = require('url')

// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow

function createWindow () {
  // Create the browser window.
  mainWindow = new BrowserWindow({width: 800, height: 600, show: false})

  // <webview> document.visibilityState will be "hidden"
  // when showing the window on read-to-show.
  mainWindow.on('ready-to-show', function() {
    mainWindow.show()
  })
  // <webview> document.visibilityState will be "visibile"
  // when showing the window on dom-ready.
  // mainWindow.webContents.on('dom-ready', function() {
  //   mainWindow.show()
  // })

  // and load the index.html of the app.
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true
  }))

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()

  // Emitted when the window is closed.
  mainWindow.on('closed', function () {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null
  })
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow)

// Quit when all windows are closed.
app.on('window-all-closed', function () {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow()
  }
})

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.

## package.json
{
  "private": true,
  "main": "main.js",
  "scripts": {
    "start": "electron ."
  },
  "devDependencies": {
    "electron": "1.7.3"
  }
}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	</head>
	<body>
	<div style="margin: 20px;">
	<p>
	<webview> visibilityState: <strong id="visibility-state"></strong>
	<button id="update-visibility-state">Update</button>
	</p>

	<webview src="https://electron.atom.io/" style="border: 1px dotted red; width: 100%; height: 400px;"></webview>
	</div>

	<script>
	const reportElement = document.getElementById("visibility-state")
	const buttonElement = document.getElementById("update-visibility-state")
	const webviewElement = document.querySelector("webview")

	function updateVisibilityState() {
	webviewElement.executeJavaScript("(function() { return document.visibilityState })()", true, function(result) {
	reportElement.textContent = result
	})
	}

	webviewElement.addEventListener("dom-ready", updateVisibilityState)
	buttonElement.addEventListener("click", updateVisibilityState)
	</script>

	<!-- All of the Node.js APIs are available in this renderer process. -->
	We are using Node.js <script>document.write(process.versions.node)</script>,
	Chromium <script>document.write(process.versions.chrome)</script>,
	and Electron <script>document.write(process.versions.electron)</script>.
	</body>
	</html>
	const electron = require('electron')
	// Module to control application life.
	const app = electron.app
	// Module to create native browser window.
	const BrowserWindow = electron.BrowserWindow

	const path = require('path')
	const url = require('url')

	// Keep a global reference of the window object, if you don't, the window will
	// be closed automatically when the JavaScript object is garbage collected.
	let mainWindow

	function createWindow () {
	// Create the browser window.
	mainWindow = new BrowserWindow({width: 800, height: 600, show: false})

	// <webview> document.visibilityState will be "hidden"
	// when showing the window on read-to-show.
	mainWindow.on('ready-to-show', function() {
	mainWindow.show()
	})
	// <webview> document.visibilityState will be "visibile"
	// when showing the window on dom-ready.
	// mainWindow.webContents.on('dom-ready', function() {
	// mainWindow.show()
	// })

	// and load the index.html of the app.
	mainWindow.loadURL(url.format({
	pathname: path.join(__dirname, 'index.html'),
	protocol: 'file:',
	slashes: true
	}))

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()

	// Emitted when the window is closed.
	mainWindow.on('closed', function () {
	// Dereference the window object, usually you would store windows
	// in an array if your app supports multi windows, this is the time
	// when you should delete the corresponding element.
	mainWindow = null
	})
	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.on('ready', createWindow)

	// Quit when all windows are closed.
	app.on('window-all-closed', function () {
	// On OS X it is common for applications and their menu bar
	// to stay active until the user quits explicitly with Cmd + Q
	if (process.platform !== 'darwin') {
	app.quit()
	}
	})

	app.on('activate', function () {
	// On OS X it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (mainWindow === null) {
	createWindow()
	}
	})

	// In this file you can include the rest of your app's specific main process
	// code. You can also put them in separate files and require them here.
	{
	"private": true,
	"main": "main.js",
	"scripts": {
	"start": "electron ."
	},
	"devDependencies": {
	"electron": "1.7.3"
	}
	}