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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

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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The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

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. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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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.

If the stylesheet 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 CSS 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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About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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.

Learn more

+ add another resource

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

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If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

HTML Settings

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HTML

            
              .note.qtip.lifted
	.text
		%span
			Quick Tip:
		You can get a whole bunch of freebies over at PremiumPixels.com - Nice!
		%br/
		%span
			Lorem ipsum:
		dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
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CSS

            
              @import compass

.note
  background: #ffffff
  color: #686a6b
  background-image: linear-gradient(0deg, rgba(255, 255, 255, 0) 15px, #e5d5d6 16px, rgba(255, 255, 255, 0) 17px, rgba(255, 255, 255, 0) 20px, #e5d5d6 21px, rgba(255, 255, 255, 0) 22px)
  border: 1px solid rgba(200, 201, 204, 0.9)
  position: relative
  &::before,
  &::after
    content: ""
    position: absolute
    z-index: -2
  &.small,
  &.tall
    float: left
    margin-left: 50px
  &.qtip
    width: 230px
    margin: 100px auto 20px
    &.lifted
      &::before,
      &::after
        bottom: 19px
        left: 10px
        width: 50%
        height: 20%
        max-width: 300px
        box-shadow: 0 15px 10px rgba(0, 0, 0, 0.7)
        transform: rotate(-2deg)
      &:after
        right: 10px
        left: auto
        transform: rotate(2deg)

.text
  background: rgba(255, 255, 255, 0)
  background-image: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0) 2px, rgba(255, 255, 255, 0) 19px, #cfe8f3 20px, rgba(255, 255, 255, 0) 22px)
  margin: 30px 0
  padding: 2px 25px
  font-size: 12px
  line-height: 20px
  &::before
    content: ''
    background: rgba(255, 255, 255, 0.7)
    border: 1px solid #c8c9cc
    width: 95px
    height: 20px
    position: absolute
    margin: 0 auto -20px
    top: -11px
    left: 70px
    transform: rotate(-1deg)
  span
    font-weight: bold
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JS
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