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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.

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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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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 

              
                - const text = 'Hello'

.stage
  .wrapper
    .slash
    .sides
      .side
      .side
      .side
      .side
    .text
      .text--backing=text
      .text--left
        .inner=text
      .text--right
        .inner=text
!

CSS 

              
                // fonts
$main-font = Josefin Sans, Helvetica, Helvetica Neue, Arial, sans-serif

// colors
$page-background = #222

// measurements
$scale = 1

// functions
grayscale(n)
  if n >= 0
    rgba(255, 255, 255, n / 100)
  else
    rgba(0, 0, 0, n / -100)
    
*, *:before, *:after
  box-sizing border-box
  font-rendering optimizeLegibility
  -webkit-font-smoothing antialiased
  -moz-osx-font-smoothing grayscale

html
body
  width 100%
  height 100%
  margin 0
  padding 0
  background #222
  font-family $main-font
  font-size 16px
  font-weight normal
  
.stage
  width 100%
  height 100%
  
  display flex
  align-items center
  justify-content center
  
.wrapper
  position relative
  color white
  font-size 2.5rem
  text-transform uppercase
  letter-spacing 0.25rem
  padding-top 0.65rem
  padding-left 0.5rem
  padding-right 0.36rem
  padding-bottom 0.2rem
  
.slash
  position absolute
  top 50%
  left 50%
  transform translate(-50%, -50%) rotate(-24deg) scaleY(0)
  transform-origin center center
  width 0.15rem
  height 145%
  background white
  z-index 4
  animation slash 6s ease-in infinite
  
  &:before
    content ''
    display block
    position absolute
    top 50%
    left 50%
    transform translate(-50%, -50%)
    width 0.75rem
    height 120%
    background #232323
    z-index -1
    
  &:after
    content ''
    display block
    position absolute
    top 0
    left 0
    width 100%
    height 100%
    background white
  
.sides
  position absolute
  width 100%
  height 100%
  top 0
  left 0
  overflow hidden
  
  .side
    position absolute
    background white
  
  .side:nth-child(1)
    top 0
    left 0
    width 100%
    height 0.15rem
    transform translateX(-101%)
    animation side-top ease 6s infinite
  
  .side:nth-child(2)
    top 0
    right 0
    width 0.15rem
    height 100%
    transform translateY(-101%)
    animation side-right ease 6s infinite
  
  .side:nth-child(3)
    left 0
    bottom 0
    width 100%
    height 0.15rem
    transform translateX(101%)
    animation side-bottom ease 6s infinite
  
  .side:nth-child(4)
    top 0
    left 0
    width 0.15rem
    height 100%
    transform translateY(101%)
    animation side-left ease 6s infinite
  
.text
  position relative
  
.text--backing
  opacity 0
  
.text--left
  position absolute
  top 0
  left 0
  width 51%
  height 100%
  overflow hidden
  
  .inner
    transform translateX(100%)
    animation text-left 6s ease-in-out infinite
  
.text--right
  position absolute
  top 0
  right 0
  width 50%
  height 100%
  overflow hidden
  
  .inner
    transform translateX(-200%)
    animation text-right 6s ease-in-out infinite
    
@keyframes slash
  0%
    transform translate(-50%, -50%) rotate(-24deg) scaleY(0)
  6%
    transform translate(-50%, -50%) rotate(-24deg) scaleY(1)
  13%
    transform translate(-50%, -50%) rotate(-24deg) scaleY(1)
  16.6% // 1 second
    transform translate(-50%, -50%) rotate(-24deg) scaleY(0)
  100%
    transform translate(-50%, -50%) rotate(-24deg) scaleY(0)
    
@keyframes text-left
  0%
    transform translateX(100%)
  10%
    transform translateX(0)
  58%
    transform translateX(0)
  70%
    transform translateX(-200%)
  100%
    transform translateX(-200%)
    
@keyframes text-right
  0%
    transform translateX(-200%)
  10%
    transform translateX(-100%)
  58%
    transform translateX(-100%)
  70%
    transform translateX(-300%)
  100%
    transform translateX(-300%)
    
@keyframes side-top
  0%
  14%
    transform translateX(-101%)
  24%
  55%
    transform translateX(0)
  65%
    transform translateX(101%)
  100%
    transform translateX(101%)
    
@keyframes side-right
  0%
  14%
  23%
    transform translateY(-101%)
  30%
  62%
    transform translateY(0)
  72%
    transform translateY(101%)
  100%
    transform translateY(101%)
    
@keyframes side-bottom
  0%
  14%
  24%
  28%
    transform translateX(101%)
  37%
  70%
    transform translateX(0)
  79%
    transform translateX(-101%)
  100%
    transform translateX(-101%)
    
@keyframes side-left
  0%
  14%
  24%
  34%
  35%
    transform translateY(101%)
  44%
  79%
    transform translateY(0)
  86%
    transform translateY(-101%)
  100%
    transform translateY(-101%)
!

JS 

              
                const curry = f => (...args) =>
  args.length >= f.length
    ? f(...args)
    : curry(f.bind(f, ...args))
      
const compose = (f, g) => x => f(g(x))
const composeN = (...fns) => (...args) =>
  fns.reverse()
    .reduce((x, f) => f.apply(f, [].concat(x)), args)
!
999px

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