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HTML

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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Insecure Resource

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CSS

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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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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JavaScript

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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Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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 

              
                <div class="group group1">
  <div class="demo1">to top</div>
  <div class="demo2">to right</div>
  <div class="demo3">to bottom</div>
  <div class="demo4">to left</div>
  <br>
  <div class="demo9">0deg</div>
  <div class="demo10">90deg</div>
  <div class="demo11">180deg</div>
  <div class="demo12">270deg</div>
  <br>
  <div class="demo5">to top right</div>
  <div class="demo6">to bottom right</div>
  <div class="demo7">to bottom left</div>
  <div class="demo8">to top left</div>
  <br>
  <div class="demo13">45deg</div>
  <div class="demo14">135deg</div>
  <div class="demo15">225deg</div>
  <div class="demo16">315deg</div>
</div>
<div class="group group2">
  <div class="demo1">BLACK</div>
  <div class="demo2">#000000</div>
  <div class="demo3">RGBA</div>
  <div class="demo4">HSLA</div>
  <br>
  <div class="demo5">RED</div>
  <div class="demo6">RED</div>
  <div class="demo7">RED</div>
  <div class="demo8">RED</div>
  <br>
  <div class="demo9">GREEN</div>
  <div class="demo10">GREEN</div>
  <div class="demo11">GREEN</div>
  <div class="demo12">GREEN</div>
  <br>
  <div class="demo13">BLUE</div>
  <div class="demo14">BLUE</div>
  <div class="demo15">BLUE</div>
  <div class="demo16">BLUE</div>
</div>
!

CSS 

              
                body, html
  margin: 0
  padding: 0
  text-align: center
  font-size: 0

.group
  display: inline-block
  background-color: #999
  border: 1px solid #333
  margin: 10px
  div 
    display: inline-block
    width: 100px
    height: 100px
    font-size: 10px
    line-height: 100px
    text-shadow: 1px 0 0 #fff, -1px 0 0 #fff, 0 -1px 0 #fff,0 1px 0 #fff
    &:nth-child(n + 5)
      margin-top: 10px
    &+div
      margin-left: 10px

$start = white
$startRGBA = rgba(255,255,255,1)
$end = black
$endSL = #000
$endRGBA = rgba(0,0,0,1)
$endHSLA = hsla(0,0,0,1)

.group1 
  .demo1
    background-image: linear-gradient(to top, $start, $end)
  .demo2
    background-image: linear-gradient(to right, $start, $end)
  .demo3
    background-image: linear-gradient(to bottom, $start, $end)
  .demo4
    background-image: linear-gradient(to left, $start, $end)
  .demo5
    background-image: linear-gradient(to top right, $start, $end)
  .demo6
    background-image: linear-gradient(to bottom right, $start, $end)
  .demo7
    background-image: linear-gradient(to bottom left, $start, $end)
  .demo8
    background-image: linear-gradient(to top left, $start, $end)
  .demo9
    background-image: linear-gradient(0deg, $start, $end)
  .demo10
    background-image: linear-gradient(90deg, $start, $end)
  .demo11
    background-image: linear-gradient(180deg, $start, $end)
  .demo12
    background-image: linear-gradient(270deg, $start, $end)
  .demo13
    background-image: linear-gradient(45deg, $start, $end)
  .demo14
    background-image: linear-gradient(135deg, $start, $end)
  .demo15
    background-image: linear-gradient(225deg, $start, $end)
  .demo16
    background-image: linear-gradient(315deg, $start, $end)

.group2 
  .demo1
    background-image: linear-gradient(90deg, transparent 40%, $end 60%)
  .demo2
    background-image: linear-gradient(90deg, #fff 40%, $endSL 60%)
  .demo3
    background-image: linear-gradient(90deg,rgba(0, 0, 0, 0) 40%,$endRGBA 60%)
  .demo4
    background-image: linear-gradient(90deg,hsla(0, 0, 0, 0) 40%,$endHSLA 60%)
  .demo5
    background-image: linear-gradient(90deg, red 40%, $end 60%)
  .demo6
    background-image: linear-gradient(90deg, #ff0000 40%, $endSL 60%)
  .demo7
    background-image: linear-gradient(90deg,rgba(255, 0, 0, 0) 40%,$endRGBA 60%)
  .demo8
    background-image: linear-gradient(90deg,hsla(0, 100%, 50%, 0) 40%,$endHSLA 60%)
  .demo9
    background-image: linear-gradient(90deg,lime 40px,$end 60px)
  .demo10
    background-image: linear-gradient(90deg, #00ff00 40px, $endSL 60px)
  .demo11
    background-image: linear-gradient(90deg,rgba(0, 255, 0, 0) 40px,$endRGBA 60px)
  .demo12
    background-image: linear-gradient(90deg,hsla(120, 100%, 50%, 0) 40px,$endHSLA 60px)
  .demo13
    background-image: linear-gradient(90deg,blue 40px,$end 60%)
  .demo14
    background-image: linear-gradient(90deg, #0000ff 40px, $endSL 60%)
  .demo15
    background-image: linear-gradient(90deg,rgba(0, 0, 255, 0) 40px,$endRGBA 60%)
  .demo16
    background-image: linear-gradient(90deg,hsla(240, 100%, 50%, 0) 40px,$endHSLA 60%)
!

JS
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