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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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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                // https://dribbble.com/shots/6713500-Otto-Tabbar
nav
  a.active(href='#')
    div
    svg
      use(xlink:href='#promoted')
    span Promoted
  a(href='#')
    div
    svg
      use(xlink:href='#search')
    span Search
  a(href='#')
    div
    svg
      use(xlink:href='#profile')
    span Profile
// SVG Sprites
svg.sprites
  symbol#promoted(viewbox='0 0 25 27')
    path(d='M8.94342328,25.3959474 C5.14987496,22.3676466 5.01119421,16.0723085 8.63367116,11.3349162 C12.2561481,6.59752386 18.2680244,5.21203143 22.0615727,8.24033223 C25.855121,11.268633 25.9938018,17.5639711 22.3713248,22.3013635 C18.7488479,27.0387558 12.7369716,28.4242482 8.94342328,25.3959474 Z M12.0433258,21.4240933 C12.5486463,19.8931888 13.0878216,18.9291121 13.5754202,18.5424943 C14.3401115,17.9361691 14.775634,17.7551931 16.1629253,17.3472112 C16.9360088,17.1198587 17.3812937,16.943494 17.8630789,16.6153189 C19.0024675,15.8392073 20.0822703,14.5520406 21.1352098,12.7589768 C21.4792132,12.1731691 21.2933,11.4133436 20.7199609,11.0618589 C20.1466218,10.7103743 19.4029688,10.9003307 19.0589654,11.4861384 C18.1748679,12.991679 17.3176338,14.0135352 16.5199854,14.5568654 C16.3018634,14.7054424 16.0418386,14.8084309 15.493203,14.9697765 C13.8254768,15.4602302 13.1696048,15.7327697 12.0909777,16.5880151 C11.1449823,17.3380966 10.3927995,18.683043 9.74899818,20.633485 C9.53532458,21.2808244 9.87571062,21.9825804 10.5092717,22.2009008 C11.1428327,22.4192213 11.8296521,22.0714327 12.0433258,21.4240933 Z M10.5800801,6.86143202 C10.3945615,6.14885319 10.132069,5.38738825 9.79440457,4.57529464 C9.53358416,3.94801341 8.8148751,3.6392159 8.18912294,3.8855761 C7.56337078,4.13193629 7.26753514,4.84016261 7.52835555,5.46744385 C8.04183043,6.70236701 8.33812328,7.7538943 8.42793752,8.61167435 C7.96334027,9.0729997 7.52125915,9.57501024 7.10726519,10.116422 C4.72725394,13.2289462 3.80844656,16.9467299 4.3264257,20.1613617 C1.90643639,18.3329281 0.210821476,15.1032109 0.0181395194,11.3467687 C-0.289790274,5.34317015 3.35781246,0.267604944 8.1652966,0.010171505 C11.3504446,-0.160382196 14.24561,1.82681485 15.9264543,4.93344884 C14.1199566,5.09223758 12.273106,5.7498153 10.5800801,6.86143202 Z')
  symbol#search(viewbox='0 0 25 27')
    path(d='M21.8818051,21.7604848 L18.6898308,18.5685105 C19.8210975,17.1885988 20.5,15.4235825 20.5,13.5 C20.5,9.081722 16.918278,5.5 12.5,5.5 C8.081722,5.5 4.5,9.081722 4.5,13.5 C4.5,17.918278 8.081722,21.5 12.5,21.5 C13.9069529,21.5 15.2290761,21.1368008 16.3777257,20.4990461 L19.6400916,23.7614119 C17.6159124,25.1725132 15.1545912,26 12.5,26 C5.59644063,26 0,20.4035594 0,13.5 C0,6.59644063 5.59644063,1 12.5,1 C19.4035594,1 25,6.59644063 25,13.5 C25,16.6664461 23.8226381,19.5579046 21.8818051,21.7604848 Z M12.5,18.5 C9.73857625,18.5 7.5,16.2614237 7.5,13.5 C7.5,10.7385763 9.73857625,8.5 12.5,8.5 C15.2614237,8.5 17.5,10.7385763 17.5,13.5 C17.5,16.2614237 15.2614237,18.5 12.5,18.5 Z')
  symbol#profile(viewbox='0 0 25 27')
    path(d='M3,12.5 L11,12.5 C11.5522847,12.5 12,12.9477153 12,13.5 L12,19.5 C12,20.0522847 11.5522847,20.5 11,20.5 L5,20.5 C4.44771525,20.5 4,20.0522847 4,19.5 L4,16.5 C4,15.9477153 3.55228475,15.5 3,15.5 C2.44771525,15.5 2,15.0522847 2,14.5 L2,13.5 C2,12.9477153 2.44771525,12.5 3,12.5 Z M1,6 L1,4 C1,2.8954305 1.8954305,2 3,2 L22,2 C23.1045695,2 24,2.8954305 24,4 L24,23 C24,24.1045695 23.1045695,25 22,25 L2,25 C1.44771525,25 1,24.5522847 1,24 L1,23 C1,22.4477153 1.44771525,22 2,22 L15,22 C15.5522847,22 16,21.5522847 16,21 L16,8 C16,7.44771525 15.5522847,7 15,7 L11,7 L11,9 C11,9.55228475 10.5522847,10 10,10 L9.5,10 C9.22385763,10 9,10.2238576 9,10.5 C9,10.7761424 8.77614237,11 8.5,11 L7.5,11 C7.22385763,11 7,10.7761424 7,10.5 C7,10.2238576 6.77614237,10 6.5,10 L6,10 C5.44771525,10 5,9.55228475 5,9 L5,7 L2,7 C1.44771525,7 1,6.55228475 1,6 Z M20,9 C19.4477153,9 19,9.44771525 19,10 L19,19 C19,19.5522847 19.4477153,20 20,20 C20.5522847,20 21,19.5522847 21,19 L21,10 C21,9.44771525 20.5522847,9 20,9 Z')
// SVG Gooey Filter
svg.svg-gooey(xmlns='http://www.w3.org/2000/svg' version='1.1')
  defs
    filter#goo
      fegaussianblur(in='SourceGraphic' stddeviation='4' result='blur')
      fecolormatrix(in='blur' mode='matrix' values='1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 18 -7' result='goo')
      feblend(in='SourceGraphic' in2='goo')
!

CSS 

              
                body
  min-height: 100vh
  display: flex
  justify-content: center
  align-items: center
  font-family: 'Roboto', sans-serif
  
*
  box-sizing: border-box
  
nav
  width: 360px
  height: 57px
  background: black
  border-radius: 3px
  a
    position: relative
    float: left
    width: calc(100% / 3)
    height: 100%
    text-align: center
    text-decoration: none
    cursor: pointer
    -webkit-tap-highlight-color: none
    div
      position: absolute
      top: 1px
      width: 32px
      height: 20px
      left: calc(50% - 16px)
      background: black
      -webkit-filter: url(#goo)
      filter: url(#goo)
      &:after
        content: ''
        position: absolute
        left: calc(50% - 6px)
        width: 12px
        height: 12px
        display: block
        background: black
        border-radius: 50%
    svg
      position: relative
      top: 15px
      width: 25px
      height: 27px
      fill: #6d6c6d
      transition: all .3s ease
      transition-delay .1s
    span
      display: block
      color: white
      font-size: 11px
      margin-top: 10px
      opacity: 0
      transform: translateY(10px)
      transition: all .3s ease
    &.active
      svg
        fill: white
        transform: translateY(-7px)
      div:after
        animation: gooey 1s ease
        animation-delay: .1s
      span
        transform: translateY(0)
        opacity: 1
     &:not(.active):hover
       svg
        fill: gray
        
.sprites
.svg-gooey
  position: absolute
  width: 0
  height: 0
  pointer-events: none
  user-select: none
      
@keyframes gooey
  50%
    transform: translateY(-20px)
!

JS 

              
                $('nav a').click ->
  $('nav a').removeClass 'active'
  $(this).addClass 'active'
!
999px

Console