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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-.

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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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>
  How much should I charge for my 
  <span id="flipper" class='flip'>
    <span class="step step0 set">template?</span>
    <span class="step step1">eBook?</span>
    <span class="step step2">web service?</span>
    <span class="step step3">another?</span>
    <span class="step step4">otro?</span>
    <span class="step step5">sick yet?</span>
    <span class="step step6">continue?</span>
  </span>
</h1>

<button class="next">next &rarr;</button>
!

CSS 

              
                @import "compass/css3";

body {
  margin: 150px;
  background: #fff;
}

h1 {
  font-family: "Proxima Nova", "Helvetica Neue";
  font-weight: 200;
  color: #444;
  
  .flip {
    display: inline-block;
    //border: 1px solid red;
    position: relative;

    width: 200px;
    height: 40px;
    position: relative;
    top: 10px;
    
    @include perspective(500);
    @include transition(all .3s ease-in-out);
    
    
    span {
      font-weight:600;
      display: block;
      width: auto;
      //border:1px solid lightgreen;
       @include transition(all .3s ease-in-out);
      opacity: 0;
      @include transform-origin(0%, 0%);
      @include transform(rotateX(90deg)); 
      
      position: absolute;
      top: -20px;
      left: 0;
      
      &.set {
        top: 0;
        opacity: 1;
        @include transform-origin(0%, 0%);
        @include transform(rotateX(0deg)); 
      } 
      
      &.down {
        top: 40px;
        opacity: 0;
        @include transform-origin(0%, 0%);
        @include transform(rotateX(-90deg)); 
      }
           
    }
  }
}
!

JS 

              
                class Flip
  constructor: (@el) ->
    @el = $(@el)
    @currentStep = 0;
    console.log("Created new Flip")
    
    $('.next').on 'click', $.proxy(@next, this)
    
  next: (event) ->
    if event
      event.preventDefault()
    
    nextStepNum   = @currentStep + 1
    currentStepEl = @el.find ".step#{@currentStep}"
    nextStepEl    = @el.find ".step#{nextStepNum}"
    
    if nextStepEl.length
      console.log('we found the next step', nextStepEl)
      
      currentStepEl.prev().removeClass 'down'
      
      currentStepEl.removeClass 'set'
      currentStepEl.addClass 'down'
      
      nextStepEl.addClass 'set'
      nextStepEl.removeClass 'down'
      
      nextStepEl.next().removeClass 'down'
      @currentStep++
      
    else
      # reset to 0
      @el.find(".step").removeClass('set');
      @el.find(".step#{@currentStep}").addClass('down');
      @el.find(".step").not(".step#{@currentStep}").removeClass('down');
      
      @currentStep = -1
      @next()
    
  
$ ->
  f = new Flip(document.getElementById('flipper'))
  setInterval ( -> 
    f.next()  
  ), 1500
!
999px

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