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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

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

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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).

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

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About External Resources

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.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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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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About Packages

Using packages here is powered by Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

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HTML 

              
                <div id="some-list" class="q" droppable="true" v-on="dragover:dragover, drop:drop">
  <div v-repeat="items" draggable="true" v-on="dragstart:dragstart, dragend:dragend, dragover:dragover, dragenter:dragenter">{{text}}</div>
  </div>
  <div id="placeholder">placeholder</div>
</div>
!

CSS 

              
                body
  background-color #eee  
.q div
  width 200px
  height 50px
  border solid 1px #ccc
  box-shadow 0 1px 2px 0px #888
  background-color #f8f8f8
  margin 5px  
  display inline-block
  position absolute
  transition top 400ms
  &#placeholder
    opacity 0.2
!

JS 

              
                
new Vue {
    el: '#some-list'
    data: {
       items: [1 to 5].map -> {text: "Item-#{it}", qqq:it}
       _dragElem: null
       _insertIndex: null
       _placeholder: document.getElementById 'placeholder'
    }
    methods: {
       reorder: !->
         sty_elem = document.createElement('style');
         document.head.appendChild sty_elem
       
         sty_elem.appendChild (document.createTextNode '')
         s = sty_elem.sheet
       
         for i from 0 to this.items.length
           e = i
           if this._dragElem?
             sourceIndex = this._dragElem.$index
             --e if sourceIndex < e
             #console.log i, e
           rule = ".q div:nth-child(#{i+1}) {top:#{e*50}px }"
           s.insertRule rule, s.cssRules.length

       dragstart: (ev) !->
           this._dragElem = ev.targetVM
           this._dragNode = ev.target
           
           this.reorder!
           st = this._dragNode.style
           Vue.nextTick !->
             st.opacity = 0
             st.height = 0
           this.$el.insertBefore this._placeholder, ev.target           
           #ev.preventDefault! # <- should not do this
       dragend: (ev) !->
           #console.log \dragend
           this.$el.removeChild this._placeholder
           this._dragNode.style.opacity = 1
           this._dragNode.style.height = '50px'

           this._dragNode = null
           this._dragElem = null
           
           this.reorder!
           ev.preventDefault!
       drop: (ev) !->
           #console.log \drop
           insertIndex = this._insertIndex
           sourceIndex = this._dragElem.$index
           return if sourceIndex == insertIndex

           removed = this.items.splice sourceIndex, 1
           this.items.splice insertIndex, 0, removed[0]
           
           this.dragend ev
       dragover: (ev) !->
           #console.log \over         
           ev.preventDefault!
           return true
       dragenter:  (ev) !->
           sourceIndex = this._dragElem.$index
           insertIndex = ev.targetVM.$index
           this._insertIndex = insertIndex

           # FIXME
           posElem = if sourceIndex < insertIndex then ev.target else ev.target.previousSibling
           
           this.$el.insertBefore this._placeholder, posElem.nextSibling
           
           ev.preventDefault!
           return true
    }
    created: !->
      this.reorder!
}
!
999px

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