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JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML

            
              <div class="container">
  
  <div class="text__container">
    <h1>YouTube Video Background</h1>
    <p>Using the YouTube iFrame Player API,
       <br /> Does not work on iOS :(</p>
  </div>
  
  <div class="player__container">
    <div class="overlay"></div>
    <div id="player"></div>
  </div>
</div>
!

CSS

            
              $bg_pattern: ' data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs+9AAAATklEQVQYV2NkYGAwZmBgOMuAACA+CKCIMSIpADGRNaEYgKwQ3WQUjTCF6CYhWw2WAynEpgjmIpg7jUlSiM0TWK2GWUOUZ7ApxggeogIcABHJFtfoX9tJAAAAAElFTkSuQmCC'

$bg_image: 'https://i.ytimg.com/vi/1kKkRtVlwrM/maxresdefault.jpg'

$font_family: Frutiger, "Frutiger Linotype", Univers, Calibri, "Gill Sans", "Gill Sans MT", "Myriad Pro", Myriad, "DejaVu Sans Condensed", "Liberation Sans", "Nimbus Sans L", Tahoma, Geneva, "Helvetica Neue", Helvetica, Arial, sans-serif

*
  box-sizing: border-box

body
  margin: 0
  font-family: $font_family
  background-color: black
  background-image: url($bg_image)
  background-repeat: no-repeat
  background-size: cover cover
  height: 100%
  
  
.container
  max-height: 400px
  margin: 0 auto
  margin-top: 2em
  position: relative
  overflow: hidden
  width: 80%
  border: 6px solid rgba(#eee, .4)

  
.player__container
  position: relative
  padding-bottom: 56.25%
  height: 0
  overflow: hidden
  max-width: 100%

  .overlay
    height: 100%
    width: 100%
    display: block
    z-index: 1
    position: absolute
    background-color: rgba(blue, .2)
    background-repeat: repeat
    //background-image: url($bg_pattern) 
  
    
  iframe, embed, object
    position: absolute
    top: 0
    left: 0
    width: 100%
    height: 100%
    z-index: -99
    //transform: translateY(-200px)
    
    
.text__container
  position: absolute
  padding: 2em
  height: 100%
  width: 100%
  z-index: 3
  
    
h1, p
  text-align: center
  color: white
  
  
h1
  font-size: 2.2em
  font-weight: 300
  text-transform: uppercase
  width: 100%
  
  
p
  font-size: 1.1em
  border: 3px solid rgba(white, .1)
  background-color: rgba(white ,.1)
  width: 40%
  min-width: 360px
  padding: 1em 2em
  margin: 0 auto
!

JS

            
              // https://developers.google.com/youtube/iframe_api_reference#Loading_a_Video_Player

var tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";

var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

var player;
function onYouTubeIframeAPIReady() {
  player = new YT.Player('player', {
    height: '390',
    width: '640',
    videoId: 'KL6jwnIln6w',
    playerVars: {
      autoplay: 1,
      autohide: 1,
      controls: 0,
      iv_load_policy: 3,
      fs: 0,
      loop: 1,
      mute: 1,
      showinfo: 0,
      modestbrangin: 1,
    },
    events: {
      'onReady': onPlayerReady,
      'onStateChange': onPlayerReady
    }
  });
}


function onPlayerReady(event) {
  event.target.playVideo();
  
  // disable audio
  player.mute();
}
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