Card Flip

HTML

<section class="container">
    <div id="card">
      <figure class="front">1</figure>
      <figure class="back">2</figure>
    </div>
</section>  

<section id="options">
    <p><button id="flip">Flip Card</button></p>
  </section>

CSS

.container {
      width: 200px;
      height: 260px;
      position: relative;
      margin: 0 auto 40px;
      border: 1px solid #CCC;
      -webkit-perspective: 800px;
         -moz-perspective: 800px;
          -ms-perspective: 800px;
           -o-perspective: 800px;
              perspective: 800px;
    }
#card {
      width: 100%;
      height: 100%;
      position: absolute;
      -webkit-transition: -webkit-transform 1s;
         -moz-transition: -moz-transform 1s;
          -ms-transition: -ms-transform 1s;
           -o-transition: -o-transform 1s;
              transition: transform 1s;
      -webkit-transform-style: preserve-3d;
         -moz-transform-style: preserve-3d;
          -ms-transform-style: preserve-3d;
           -o-transform-style: preserve-3d;
              transform-style: preserve-3d;
    }
    
    #card.flipped {
      -webkit-transform: rotateY( 180deg );
         -moz-transform: rotateY( 180deg );
          -ms-transform: rotateY( 180deg );
           -o-transform: rotateY( 180deg );
              transform: rotateY( 180deg );
    }
#card figure {
      display: block;
      height: 100%;
      width: 100%;
      line-height: 260px;
      color: white;
      text-align: center;
      font-weight: bold;
      font-size: 140px;
      position: absolute;
      -webkit-backface-visibility: hidden;
         -moz-backface-visibility: hidden;
          -ms-backface-visibility: hidden;
           -o-backface-visibility: hidden;
              backface-visibility: hidden;
    }
    
    #card .front {
      background: red;
    }
    
    #card .back {
      background: blue;
      -webkit-transform: rotateY( 180deg );
         -moz-transform: rotateY( 180deg );
          -ms-transform: rotateY( 180deg );
           -o-transform: rotateY( 180deg );
              transform: rotateY( 180deg );
    }

JavaScript

var init = function() {
  var card = document.getElementById('card');
    
  document.getElementById('flip').addEventListener( 'click', function(){
      alert('hhh');
    card.toggleClassName('flipped');
  }, false);
};

window.addEventListener('DOMContentLoaded', init, false);