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HTML

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About the <head>

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CSS

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CSS Base

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JavaScript

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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 

              
                <h1>Simple jQuery Acordion</h1>
<dl class="accordion">

<dt><a href="">Panel 1</a></dt>
<dd>Pellentesque fermentum dolor. Aliquam quam lectus, facilisis auctor, ultrices ut, elementum vulputate, nunc.</dd>

<dt><a href="">Panel 2</a></dt>
<dd>Donec nec justo eget felis facilisis fermentum. Aliquam porttitor mauris sit amet orci. Aenean dignissim pellentesque felis.</dd>

<dt><a href="">Panel 3</a></dt>
<dd>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Phasellus hendrerit. Pellentesque aliquet nibh nec urna. In nisi neque, aliquet vel, dapibus id, mattis vel, nisi. Sed pretium, ligula sollicitudin laoreet viverra, tortor libero sodales leo, eget blandit nunc tortor eu nibh. Nullam mollis. Ut justo. Suspendisse potenti.</dd>

</dl>
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CSS 

              
                .accordion {
  margin: 50px;
}
.accordion dt, .accordion dd {
  padding: 10px;
  border: 1px solid black;
  border-bottom: 0;
}
.accordion dt:last-of-type, .accordion dd:last-of-type {
  border-bottom: 1px solid black;
}
.accordion dt a, .accordion dd a {
  display: block;
  color: black;
  font-weight: bold;
}
.accordion dd {
  border-top: 0;
  font-size: 12px;
}
.accordion dd:last-of-type {
  border-top: 1px solid white;
  position: relative;
  top: -1px;
}
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JS 

              
                (function($) {
    
  var allPanels = $('.accordion > dd').hide();
    
  $('.accordion > dt > a').click(function() {
    allPanels.slideUp();
    $(this).parent().next().slideDown();
    return false;
  });

})(jQuery);
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999px

Console