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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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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-.

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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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Packages

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HTML 

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

CSS 

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

Poptart

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

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

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

@keyframes handle2
  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 poptart
  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: lighten(mediumaquamarine,25)
  z-index: -2
  position: relative
  height: 100vh

#poptart
  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, lighten(mediumaquamarine,10) 40px,mediumaquamarine 40px),
                    linear-gradient(to bottom, black(.3), black(.3)),
                    linear-gradient(to right, mediumaquamarine 50px,lighten(mediumaquamarine,10) 50px),
                    linear-gradient(to right, #ccc 50px, white 50px),
                    linear-gradient(to right, #ccc, #ccc),
                    linear-gradient(to right, #ccc, #ccc),
                    linear-gradient(to right, white, white),
                    linear-gradient(to right, white, white)
  background-size: 50px 50px,
                   55px 55px,
                   5px 70px,
                   100% 87%,
                   100% 15px,
                   15px 10px,
                   15px 10px,
                   15px 10px,
                   15px 10px
  background-position: 94% 67%,
                       35px -15px,
                       22px 30px,
                       0 0,
                       0 93%,
                       0 100%,
                       35px 100%,
                       45px 100%,
                       100% 100%
  border-radius: 40px 40px 0 0

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

  &:before
    width: 30px
    height: 10px
    left: 10px
    top: 25px
    background-color: white
    border-radius: 2px 2px 10px 10px
    animation: handle2 4000ms infinite

  &:after
    width: 75px
    height: 100px
    margin-left: -(@width/2)
    left: 50%
    top: -30px
    z-index: -1
    background-color: white
    background-repeat: no-repeat, no-repeat,
                       no-repeat, no-repeat,
                       no-repeat, no-repeat, no-repeat, no-repeat,
                       repeat,
                       repeat,
                       repeat,
                       repeat,
                       repeat,
                       repeat,
                       repeat,
                       repeat,
                       repeat
    background-image: repeating-linear-gradient(to right, black(0), transparent 5px,
                                                                    tan 5px,
                                                                    tan 7px,
                                                                    transparent 7px),
                      repeating-linear-gradient(to right, black(0), transparent 5px,
                                                                    tan 5px,
                                                                    tan 7px,
                                                                    transparent 7px),
                      linear-gradient(to bottom, lighten(tan,10) 10px, transparent 10px,
                                                 transparent 90px, lighten(tan,10) 90px),
                      linear-gradient(to right, lighten(tan,10) 5px, transparent 5px,
                                                transparent 70px, lighten(tan,10) 70px),
                      radial-gradient(circle at bottom right, transparent 5px, lighten(tan,10) 5px),
                      radial-gradient(circle at bottom left, transparent 5px, lighten(tan,10) 5px),
                      radial-gradient(circle at top right, transparent 5px, lighten(tan,10) 5px),
                      radial-gradient(circle at top left, transparent 5px, lighten(tan,10) 5px),
                      radial-gradient(circle at 3px 3px, red 1px, transparent 1px),
                      radial-gradient(circle at 16px 3px, green 1px, transparent 1px),
                      radial-gradient(circle at 10px 8px, gold 1px, transparent 1px),
                      radial-gradient(circle at 4px 16px, green 1px, transparent 1px),
                      radial-gradient(circle at 17px 16px, red 1px, transparent 1px),
                      radial-gradient(circle at 11px 19px, gold 1px, transparent 1px),
                      radial-gradient(circle at 3px 27px, green 1px, transparent 1px),
                      radial-gradient(circle at 17px 25px, gold 1px, transparent 1px),
                      radial-gradient(circle at 10px 30px, red 1px, transparent 1px)
    background-size: 100% 6px, 100% 6px,
                     100% 100%, 100% 100%,
                     5px 5px, 5px 5px, 5px 5px, 5px 5px,
                     21px 33px,
                     21px 33px,
                     21px 33px,
                     21px 33px,
                     21px 33px,
                     21px 33px,
                     21px 33px,
                     21px 33px,
                     21px 33px
    background-position: 0 0, 0 100%,
                         0 0, 0 0,
                         5px 10px, 65px 10px, 5px 85px, 65px 85px,
                         6px 12px,
                         6px 12px,
                         6px 10px,
                         6px 10px,
                         6px 10px,
                         6px 10px,
                         6px 10px,
                         6px 10px,
                         6px 10px
    border-radius: 3px
    animation: poptart 4000ms infinite
!

JS 

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

Console