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HTML

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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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Adding Classes

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About the <head>

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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).

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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.

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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.

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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 

              
                h1 Tap!
input#checker.sr-only(type="checkbox")
label(for="checker")
.transform
  span rotateX(-24deg)
  span rotateY(32deg)
  span rotateX(90deg)
  span translateZ(calc(var(--depth) + var(--stack-height)) * -1)
- const RING_COUNT = 10;
.container
  .scene
    .plane(style=`--ring-count: ${RING_COUNT}`)
      - let rings = 0;
      while rings < RING_COUNT
        .ring(style=`--index: ${rings};`)
        - rings++;
!

CSS 

              
                @property --rotate-x
  initial-value 0deg
  inherits false
  syntax '<angle>'

@property --rotate-y
  initial-value 0deg
  inherits false
  syntax '<angle>'
  
@property --flatten
  initial-value 0deg
  inherits false
  syntax '<angle>'
  
@property --translate-z
  initial-value 0
  inherits false
  syntax '<length>'


:root
  --border-width 1.2vmin
  --depth 20vmin
  --stack-height 6vmin
  --scene-size 20vmin
  --ring-size calc(var(--scene-size) * 0.6)
  --plane radial-gradient(hsla(0, 0%, 0%, 0.1) 50%, transparent 65%)
  --ring-shadow hsla(0, 0%, 0%, 0.5)
  --hue-one 320
  --hue-two 210
  --blur 10px
  --speed 1.2s
  --bg hsl(0, 0%, 98%)
  --ring-filter brightness(1) drop-shadow(0 0 0 var(--accent))
  --transition 0.5s

label
  position fixed
  height 100vmax
  width 100vmax
  top 50%
  left 50%
  z-index 4
  transform translate(-50%, -50%)
  
.sr-only
  position absolute
  width 1px
  height 1px
  padding 0
  margin -1px
  overflow hidden
  clip rect(0, 0, 0, 0)
  white-space nowrap
  border-width 0

*
  box-sizing border-box
  transform-style preserve-3d
  
h1
  font-family sans-serif
  font-size 3rem
  position fixed
  bottom 2rem
  right 2rem
  color hsl(0, 0%, 15%)
  margin 0
  
body
  display grid
  place-items center
  min-height 100vh
  overflow hidden
  
.transform
  display flex
  align-items center
  justify-content center
  position absolute
  flex-wrap wrap
  top 50%
  gap 0.5rem
  transform translate3d(0, -20vmin, 200vmin)
  z-index 3
  
  span
    background hsla(0, 0%, 10%, 0.85)
    padding 0.5rem
    border-radius 0.5rem
    opacity var(--opacity, 0)
    transition opacity var(--transition)
    transition-delay var(--delay, 0)
    font-family sans-serif
    font-weight bold
    color hsl(0, 0%, 100%)
    white-space nowrap
    
    &:nth-of-type(1)
      --delay calc(var(--transition) * 3)
    &:nth-of-type(2)
      --delay calc(var(--transition) * 2)
    &:nth-of-type(3)
      --delay var(--transition)
    &:nth-of-type(4)
      --delay 0s
  
.container
  height var(--scene-size)
  width var(--scene-size)
  transform translate3d(0, 0, 100vmin) rotateX(var(--rotate-x)) rotateY(var(--rotate-y)) rotateX(var(--flatten)) translateZ(var(--translate-z)) rotate(0deg)
  transition --rotate-x var(--transition) calc(var(--transition) * 3), --rotate-y var(--transition) calc(var(--transition) * 2), --flatten var(--transition) var(--transition), --translate-z var(--transition) 0s   
 
:checked ~ .container
  --rotate-x -24deg
  --rotate-y 32deg
  --flatten 90deg
  --translate-z calc((var(--depth) + var(--stack-height)) * -1)
  transition --rotate-x var(--transition) 0s, --rotate-y var(--transition) var(--transition), --flatten var(--transition) calc(var(--transition) * 2), --translate-z var(--transition) calc(var(--transition) * 3)

:checked ~ .transform
  --opacity 1
  
  span
    &:nth-of-type(4)
      --delay calc(var(--transition) * 3)
    &:nth-of-type(3)
      --delay calc(var(--transition) * 2)
    &:nth-of-type(2)
      --delay var(--transition)
    &:nth-of-type(1)
      --delay 0s
  
.scene
.plane
  height 100%
  width 100%
  position relative
  
.scene
  background hsla(280, 80%, 50%, 0.25)

.plane
  background hsla(200, 80%, 50%, 0.25)
  transform translate3d(0, 0, var(--depth))
!

JS
!
999px

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