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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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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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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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HTML

            
              // Manual trigger to refresh the page
.trigger
  a(href="https://s.codepen.io/brianhaferkamp/debug/jGXoZK") <i class="zmdi zmdi-refresh-alt"></i>
  
// Chicago
#chicago
  .title
    h1 Chicago
    h2 City of the Big Shoulders
!

CSS

            
              *
  box-sizing: border-box

body
  margin: 0
  
// manual page refresh icon
.trigger
  position: fixed
  top: 2rem
  right: 2rem
  
  
  a
    font-size: 2rem
    color: white
    transition: color 200ms ease
  
    &:hover
      color: rgba(white, 0.7)
  
// background image
#chicago
  background:
    size: cover
    position: center
    repeat: no-repeat
  height: 100vh
  width: 100vw
  
// title text, bottom right
.title
  margin: 0
  color: white
  position: absolute
  bottom: 2rem
  right: 2rem
  font-family: 'Cabin', sans-serif
  letter-spacing: 2px
  
  h1
    font-size: 2rem
    text-transform: uppercase
    margin-bottom: .5rem
    // drop shadow on the letters sets it off the bground
    text-shadow: 1px 1px 20px rgba(black, 0.3)
    
  h2
    font-size: 1.3rem
    font-weight: 400
    margin: 0
    // drop shadow on the letters sets it off the bground
    text-shadow: 1px 1px 5px rgba(black, 0.3)
!

JS

            
              // control the auto refresh rate -> 1000 = 1 second
var refreshRate = 10000; // 10 seconds


// Automatically reload the browser
setInterval(function() {
   window.location.reload();
}, refreshRate);

// Hide the images on load
$('#chicago').hide();

// Get a random image from Unsplash and fade it in on load
$('#chicago').css({
  // serves a random image from this collection on Unsplash.com
  'background-image' : 'url(https://source.unsplash.com/collection/495468/1600x900)'
}).fadeIn(1500);
!
999px
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