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About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

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Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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).

     

Add External Stylesheets/Pens

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

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

You can also link to another Pen here, and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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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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.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

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

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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.

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HTML

            
              <div class="header animated fadeInLeft">
  <div class="container">
    <div class="site-brand">Navigation Example</div>
    <nav>
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Work</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>
  </div>
</div>

<div class="header-sticky">
  <div class="container">
    <div class="site-brand">Navigation Example</div>
    <nav>
      <ul>
        <li><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Work</a></li>
        <li><a href="#">Contact</a></li>
      </ul>
    </nav>
  </div>
</div>

<div class="opening"></div>
<div class="content">
  <div class="container">
    <h1>Scroll Down</h1>
    
    <p>Uses <a href="https://daneden.github.io/animate.css/">animate.css</a> for all my animations.</p>
    
    <p>I bet there is a better way to do this without using 2 headers. Let me know if you have a better solution!</p>
    
    <p>Pop-up salvia meh, direct trade vinyl normcore Intelligentsia seitan pickled. Normcore Shoreditch distillery, Neutra artisan health goth hashtag keffiyeh sartorial chia umami next level cold-pressed lo-fi. Pitchfork Carles heirloom biodiesel dreamcatcher semiotics, food truck sriracha Thundercats fingerstache 8-bit. Wayfarers Bushwick occupy four loko cardigan, skateboard crucifix Pinterest twee. Semiotics keytar selfies iPhone, tofu tousled umami Kickstarter Pitchfork Shoreditch polaroid 3 wolf moon Neutra Odd Future drinking vinegar. Heirloom yr squid Helvetica aesthetic. Pickled cred asymmetrical, twee listicle slow-carb Thundercats wolf Etsy post-ironic banh mi cold-pressed tousled pop-up.</p>

    <p>IPhone pug wayfarers Pinterest, sustainable readymade butcher pop-up actually mixtape bitters ethical. Fap cronut cardigan, bespoke heirloom Banksy flannel tousled. Fixie YOLO blog distillery, squid PBR put a bird on it Shoreditch pour-over 3 wolf moon heirloom ennui salvia paleo sustainable. Brunch fashion axe vegan, organic mumblecore skateboard selvage kitsch fixie DIY hella. Hella paleo Pinterest, XOXO put a bird on it chillwave Carles disrupt Kickstarter locavore American Apparel tilde twee pickled church-key. +1 ugh forage pop-up, artisan paleo skateboard. Hashtag before they sold out deep v, lo-fi gastropub crucifix salvia four loko Portland cronut Truffaut.</p>
    </div>
</div>
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CSS

            
              body{
  font-family: 'Noto Sans', sans-serif;
  font-size: 20px;
  line-height: 1.45;
  margin: 0;
  padding: 0;
}

.container{
  width: 600px;
  margin: auto;
}

.header{
  position: fixed;
  width: 100%;
  top: 0;
  padding: 20px 0;
}

.header-sticky{
  background: tomato;
  position: fixed;
  width: 100%;
  padding: 10px 0;
  opacity: 0;
  
  .site-brand{
    float: left;
  }
  
  nav{
    float: right;
    li{
      float: left;
      display: inline-block;
      margin-left: 20px;
    }
  }
}

.site-brand{
  color: #fff;
}

.opening{
  background: DarkTurquoise ;
  height: 400px;
}

nav{
  
  ul{
    padding: 0;
    margin: 0;
  }
  
  li{
    display: block;
  }
  
  a{
    color: #fff;
    text-decoration: none;
  }
}

.hidden{
  display: none;
}
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JS

            
              
$(document).ready(function(){
  $(window).scroll(function(){
    var scrollTop = $(window).scrollTop();
    if (scrollTop > 249) {
        $('.header').addClass('fadeOutLeft');
        $('.header').removeClass('fadeInLeft');
        $('.header-sticky').addClass('fadeInDown');
        $('.header-sticky').removeClass('fadeOutUp');
        $('.header-sticky').addClass('animated');      
    } else {
        $('.header').addClass('fadeInLeft');
        $('.header').removeClass('fadeOutLeft');
        $('.header-sticky').addClass('fadeOutUp');
        $('.header-sticky').removeClass('fadeInUp');

    }
  });
});
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