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A Pen By Jason

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About the <head>

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About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

     

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

     

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About JavaScript Preprocessors

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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About ES6 Modules

Modules are a feature that allow your browsers JavaScript to use import statements to import functions, objects or primitives.

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About External Resources

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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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HTML

            
              <header>
  <nav>
    <ul>
    <li><a class="foo" href="#">One</a></li>
    <li><a class="foo" href="#">Two</a></li>
    <li><a class="foo" href="#">Three</a></li>
    <li><a class="foo" href="#">Four</a></li>
    <li><a class="foo" href="#">Five</a></li>
    </ul>
  </nav>
</header>
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CSS

            
              @import "compass/css3";

$light:#DBEAF8;
$dark:#0066CC;
$small:1.4em;
$big:1.8em;


nav {
  
  ul {
    display:inline;
    list-style-type:none;
    width:70%;
    margin:auto;
  }

  li {
    float:left;
    }
  
  a {
    display:block;
    width:60px;
    text-decoration:none;
    text-align:center;
    color:#fff;
  }
  
}

.foo {
  padding: 20px 100px;
  background: $dark;
  font-size: $small;
  color:$light;
  border-radius:0px;
  
  -webkit-transition-property: background;
  -webkit-transition-duration: 0.5s;
  -webkit-transition-timing-function: ease;
  -moz-transition-property: background;
  -moz-transition-duration: 0.5s;
  -moz-transition-timing-function: ease;
  -o-transition-property: background;
  -o-transition-duration: 0.5s;
  -o-transition-timing-function: ease;
  transition-property: background;
  transition-duration: 0.5s;
  transition-timing-function: ease;
  
  -webkit-transition-property: border-radius;
  -webkit-transition-duration: 0.5s;
  -webkit-transition-timing-function: ease;
  -moz-transition-property: border-radius;
  -moz-transition-duration: 0.5s;
  -moz-transition-timing-function: ease;
  -o-transition-property: border-radius;
  -o-transition-duration: 0.5s;
  -o-transition-timing-function: ease;
  transition-property: border-radius;
  transition-duration: 0.5s;
  transition-timing-function: ease;
  
  &:hover {
    background: lighten($dark, 10%);
    border-radius:0 120px 0 0;
  }
}
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JS
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