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HTML

About HTML Preprocessors

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>

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

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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 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 

              
                .window
  .icons: span
  
  .title spacy_demo.py
   
  pre.lang-python
    code.
      import spacy.en
      from spacy.symbols import VERB, nsubj, dobj

      def find_acquisitions(nlp, text, buy_words):
          doc = nlp(text)
          for ent in doc.ents:
              ent.merge(ent.root.tag_, ent.text, ent.label_)
          buy_words = set(nlp.vocab.strings[w] for w in buy_words)
          for token in doc:
              if token.pos == VERB and token.lemma in buy_words:
                  buyer = [w for w in token.lefts if w.dep == nsubj]
                  bought = [w for w in token.rights if w.dep == dobj]
                  if buyer and bought:
                      yield token, buyer[0], bought[0]
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Lato:400,700|Source+Code+Pro:700)

$font-size: 16px
$width: 800px
$border-radius: 10px

$black: #222
$grey-dark: #999
$grey-light: #ddd
$blue: #09a3d5
$purple: #8130c9
$red: #e4514f
$yellow: #f4c025
$green: #3ec930

*
  padding: 0
  margin: 0

body
  align-items: center
  background: $blue
  display: flex
  font: bold $font-size 'Lato', arial, sans-serif
  height: 100vh
  justify-content: center
  width: 100vw

.window
  background: $grey-light
  border-radius: $border-radius
  display: flex
  flex-flow: row wrap
  position: relative
  width: $width
  
.title
  flex: 1
  text-align: center
  padding: 0.75em

.icons
  padding: 0.75em
  position: absolute

  span
    @extend %icon
    background: $yellow
  
  &:before
    @extend %icon
    content: ''
    background: $red
  
  &:after
    @extend %icon
    content: ''
    background: $green

%icon
  display: inline-block
  float: left
  width: 1em
  height: 1em
  border-radius: 50%
  margin-right: 0.5em

pre
  background: #222
  border-bottom-left-radius: $border-radius
  border-bottom-right-radius: $border-radius
  color: #fff
  overflow: scroll
  padding: 2.5em
  width: 100%
  -webkit-font-smoothing: antialiased

  code
    font: bold #{1em}/#{1.75} 'Source Code Pro', monospace
    
    &:after
      animation: blink 0.9s infinite
      font: initial
      display: block
      opacity: 1
      content: '\258b'
  
.token.punctuation
  color: $grey-dark

.token.boolean,
.token.number
  color: $purple

.token.keyword
  color: $blue

.token.operator
  color: $red
  
@keyframes blink
  0% 
    opacity: 1
  50%
    opacity: 0
  100%
    opacity: 1
  
@media(max-width: #{$width})
  pre
    font-size: 10px
    
  .window
    width: 70%
!

JS
!
999px

Console