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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

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

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

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 URLs 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 its URL and the proper URL extension.

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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 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.

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

Behavior

Auto Save

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Auto-Updating Preview

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

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

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Visit your global Editor Settings.

HTML 

              
                <div class="container">
  <h1>257</h1>
</div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Press+Start+2P);

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Press Start 2P', cursive;
  background: #59C4B4;
}

.container {
  margin: auto;
  top: 0; left: 0; bottom: 0; right: 0;
  position:absolute;
  width: 250px;
  height: 250px;
}

h1 {
  color: #fff;
  font-size: 80px;
  transform: rotate(20deg) skew(-20deg);
  -webkit-transform: rotate(20deg) skew(-20deg);
  -moz-transform: rotate(20deg) skew(-20deg);
  -o-transform: rotate(20deg) skew(-20deg);
  -ms-transform: rotate(20deg) skew(-20deg);
  text-shadow: 1px 1px 0 #51B3A3, 
    2px 2px 0 #51B3A3, 
    3px 4px 0 #51B3A3, 
    4px 5px 0 #51B3A3,
    5px 7px 0 #51B3A3,
    6px 8px 0 #51B3A3,
    7px 10px 0 #51B3A3,
    8px 11px 0 #51B3A3,
    9px 13px 0 #51B3A3,
    10px 14px 0 #51B3A3,
    11px 16px 0 #51B3A3,
    12px 17px 0 #51B3A3,
    13px 19px 0 #51B3A3,
    14px 20px 0 #51B3A3,
    15px 22px 0 #51B3A3,
    16px 23px 0 #51B3A3,
    17px 25px 0 #51B3A3,
    18px 26px 0 #51B3A3,
    19px 28px 0 #51B3A3,
    20px 29px 0 #51B3A3,
    21px 30px 0 #389788,
    23px 31px 0 #389788,
    24px 32px 0 #389788,
    26px 33px 0 #389788,
    27px 34px 0 #389788,
    29px 35px 0 #389788,
    30px 36px 0 #389788,
    32px 37px 0 #389788,
    33px 38px 0 #389788,
    35px 39px 0 #389788,
    36px 40px 0 #389788,
    38px 41px 0 #389788,
    39px 42px 0 #389788,
    41px 43px 0 #389788,
    42px 44px 0 #389788,
    44px 45px 0 #389788,
    45px 46px 0 #389788,
    47px 47px 0 #389788,
    48px 49px 0 #7ee5d6,
    49px 51px 0 #7ee5d6,
    50px 53px 0 #7ee5d6,
    51px 55px 0 #7ee5d6,
    52px 57px 0 #7ee5d6,
    53px 59px 0 #7ee5d6,
    54px 61px 0 #7ee5d6,
    55px 63px 0 #7ee5d6,
    56px 65px 0 #7ee5d6,
    57px 67px 0 #7ee5d6,
    58px 69px 0 #7ee5d6,
    59px 71px 0 #7ee5d6,
    60px 73px 0 #7ee5d6,
    61px 75px 0 #7ee5d6,
    62px 77px 0 #7ee5d6,
    63px 79px 0 #7ee5d6,
    65px 80px 0 #51B3A3,
    68px 81px 0 #51B3A3,
    70px 82px 0 #51B3A3,
    72px 83px 0 #51B3A3,
    74px 84px 0 #51B3A3,
    76px 85px 0 #51B3A3,
    78px 86px 0 #51B3A3,
    80px 87px 0 #51B3A3,
    82px 88px 0 #51B3A3,
    84px 89px 0 #51B3A3,
    86px 90px 0 #51B3A3,
    88px 91px 0 #51B3A3,
    90px 92px 0 #51B3A3;
}
!

JS
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999px

Console