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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

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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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.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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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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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Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

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HTML 

              
                <div id="toast"></div>
!

CSS 

              
                /*-----------------------------

Toast

-----------------------------*/

white(alpha)
  rgba(255,255,255,alpha)

black(alpha)
  rgba(0,0,0,alpha)

@keyframes handle
  0
    transform: translateY(0)
    animation-timing-function: ease-in
  15%
    transform: translateY(60px)
  55%
    transform: translateY(60px)
    animation-timing-function: ease-out
  58%
    transform: translateY(0)
  100%
    transform: translateY(0)

@keyframes toast
  0
    transform: translateY(0)
    animation-timing-function: ease-in
  15%
    transform: translateY(40px)
  55%
    transform: translateY(40px) scale(1,1)
    animation-timing-function: ease-out
  58%
    transform: translateY(-135px) scale(.6,1.4)
  63%
    transform: translateY(-135px) scale(1,1)
    animation-timing-function: ease-in
  78%
    transform: translateY(0) scale(1,1)
  83%
    transform: translateY(0) scale(1.1,.8)
  85% 
    transform: translateY(0) scale(1,1)

body
  background: #eee
  z-index: -2
  height: 100vh
  position: relative

#toast
  width: 200px
  height: 135px
  position: absolute
  left: 50%
  top: 50%
  margin-left: -(@width/2)
  margin-top: 20px
  background-repeat: no-repeat
  background-image: radial-gradient(circle at top left, white(0) 50px, white(.3) 50px),
                    radial-gradient(circle at bottom right, #ccc 20px, #bbb 20px),
                    linear-gradient(to bottom, #777, #777),
                    linear-gradient(to right, #bbb 50px, #ccc 50px),
                    linear-gradient(to right, #444 50px, #777 50px),
                    linear-gradient(to right, #444, #444),
                    linear-gradient(to right, #444, #444),
                    linear-gradient(to right, #777, #777),
                    linear-gradient(to right, #777, #777)
  background-size: 50px 50px,
                   25px 25px,
                   5px 80px,
                   100% 87%,
                   100% 10px,
                   10px 10px,
                   10px 10px,
                   10px 10px,
                   10px 10px
  background-position: 94% 67%,
                       45px -5px,
                       22px 20px,
                       0 0,
                       0 93%,
                       0 100%,
                       40px 100%,
                       50px 100%,
                       100% 100%
  border-radius: 18px 18px 0 0

  &:before, &:after
    display: block
    content: ''
    position: absolute

  &:before
    width: 30px
    height: 10px
    left: 10px
    top: 25px
    background-color: #333
    border-radius: 4px
    animation: handle 4000ms infinite

  &:after
    width: 100px
    height: 90px
    margin-left: -(@width/2)
    left: 50%
    top: -40px
    z-index: -1
    background-repeat: no-repeat
    background-image: linear-gradient(to right, tan, tan),
                      radial-gradient(ellipse, tan 45px, transparent 45px),
                      linear-gradient(to right, darken(tan, 15), darken(tan, 15)),
                      radial-gradient(ellipse, darken(tan, 15) 50px, transparent 50px)
    background-size: 78px 80%,
                     90px 46px,
                     12px 80%,
                     100px 47px
    background-position: 17px 100%,
                         10px 0,
                         5px 100%,
                         0 0
    animation: toast 4000ms infinite
!

JS 

              
                // Visit a.singlediv.com to see more <3
!
999px

Console