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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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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-.

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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

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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HTML 

              
                form(class="search")
  span
  input(
    type="search", 
    name="q", 
    placeholder="What are you looking for ?", 
    autocomplete="off", 
    required
  )
  button(type="submit") &#128270;
!

CSS 

              
                // ---- VARIABLES

$inputWidth: 450px
$searchBtnSize: 70px
$borderWeight: 4px
$searchColor: #2196F3
$transitionDuration: .25s
$transitionTiming: ease

// ---- MIXINS

=hidden
  visibility: hidden
  opacity: 0
  
=visible
  visibility: visible
  opacity: 1

// ---- DOCUMENT

html, body
  height: 100%
  
body
  display: flex
  align-items: center
  justify-content: center
  
*
  box-sizing: border-box !important
  
// ---- SEARCH FORM : NORMAL STATE

.search
  position: relative
  width: $inputWidth
  height: $searchBtnSize

  span
    display: block
    position: absolute
    left: 50%
    top: 50%
    height: $searchBtnSize
    width: $searchBtnSize
    border: $borderWeight solid $searchColor
    border-radius: 100%
    cursor: pointer
    transform: translate(-50%, -50%) rotate(-30deg)
    transition: transform $transitionDuration ($transitionDuration * 3) $transitionTiming, height $transitionDuration $transitionDuration $transitionTiming, border-radius $transitionDuration $transitionDuration $transitionTiming

    &:after
      content: ''
      position: inherit
      top: ($searchBtnSize - $borderWeight - 1)
      left:  ($searchBtnSize / 2) - ($borderWeight * 2)
      height: ($searchBtnSize / 2)
      width: ($borderWeight * 2)
      background: $searchColor
      transition: all $transitionDuration ($transitionDuration * 2) $transitionTiming
  
  button
    position: absolute
    left: calc(100% - #{$searchBtnSize} - (#{$borderWeight} * 2))
    top: ($borderWeight * 2)
    height: calc(100% - (#{$borderWeight} * 4))
    width: $searchBtnSize
    background: none
    border: 0
    border-radius: $searchBtnSize
    font-size: 22px
    color: $searchColor
    outline: none
    transition: all $transitionDuration $transitionTiming
    +hidden
  
  input
    width: 100%
    height: 100%
    padding: 15px ($searchBtnSize + ($borderWeight * 2)) 15px 15px
    background: none
    border: 0
    font-size: 22px
    font-family: 'Open Sans', sans-serif
    color: $searchColor
    outline: none
    transition: all $transitionDuration $transitionTiming
    +hidden
  

      
// ---- SEARCH FORM : ACTIVE STATE

.search.active
  
  span
    height: $inputWidth
    border-radius: $searchBtnSize
    cursor: initial
    transform: translate(-50%, -50%) rotate(-90deg)
    transition: transform $transitionDuration $transitionTiming, height $transitionDuration ($transitionDuration * 2) $transitionTiming, border-radius $transitionDuration ($transitionDuration * 2) $transitionTiming
    
    &:after
      height: 0
      transition-delay: $transitionDuration
  
  button
    +visible
    transition-delay: ($transitionDuration * 3)
      
  input
    position: relative
    +visible
    transition-delay: ($transitionDuration * 3)
!

JS 

              
                /**
  Remove active class on submit
**/
$('form').submit(function(e) {
  e.preventDefault();
  if ($(this).hasClass('active')) 
    $(this).removeClass('active');
});

/**
  Show/Hide form inputs
**/
$('.search span').click(function(e) {
  
  var $parent = $(this).parent();

  if (!$parent.hasClass('active')) {
    
    $parent
      .addClass('active')
      .find('input:first')
      .on('blur', function() {
        if (!$(this).val().length) $parent.removeClass('active');
      }
    );
    
  }
});
!
999px

Console