Pen Settings

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <h1>One-click play+fullscreen via YouTube API</h1>
Suggested code from this <a href="">StackOverflow answer</a>

  <li>Click on [play fullscreen]</li>
  <li>Click on the fullscreen button in youtube's player to exit fullscreen</li>

<script src=""></script>
<button>play fullscreen</button><br>
<div id="player"></div>

## Safari 8

It works perfectly:

0. Enters fullscreen
0. Exits fullscreen

## Firefox 35

Buggy, annoying but working:

0. Enters fullscreen (on
0. Enters fullscreen (
0. Third click: Exits fullscreen

## Chrome 40

Buggy, broken:

0. Enters fullscreen (on
0. Does nothing
0. Third click: Exits fullscreen but the video fills the iframe, effectively breaking the site. <a href="" target="_blank">Screenshot</a>

## Mobile browsers

This is the default behavior on iPhone, but it cannot work anywhere else (Android, iPad) since 

* to `play()` a video or to `requestFullScreen()` you need a user tap **in the same document** (read: not across the iframe)

This means that

* you can't call `requestFullScreen()` when the video emits the event `onplay`
* you can't trigger `play()` via YouTube API (it would cross the frame) **and** call `requestFullScreen()` in the same tap

So with one tap **either** you play the video **or** get it fullscreen; you'll always need two separate taps if you use YouTube.

              html {
  padding: 1em;
button {
  width: 200px;
  height: 100px;
  margin-bottom: 1em;
              var player, iframe;
var $ = document.querySelector.bind(document);

// init player
function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    height: '200',
    width: '300',
    videoId: 'dQw4w9WgXcQ',
    events: {
      'onReady': onPlayerReady

// when ready, wait for clicks
function onPlayerReady(event) {
  var player =;
  iframe = $('#player');

function setupListener (){
$('button').addEventListener('click', playFullscreen);

function playFullscreen (){
  player.playVideo();//won't work on mobile
  var requestFullScreen = iframe.requestFullScreen || iframe.mozRequestFullScreen || iframe.webkitRequestFullScreen;
  if (requestFullScreen) {

🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.