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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.

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Auto Save

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Format on Save

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HTML 

              
                <small>Sorry, Chrome only for this animation</small>
<svg  xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" viewBox="0 0 124 124">
  <path></path>
</svg>
!

CSS 

              
                svg {
	height: 300px;
	width: 300px;
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate3d(-50%,-50%,1px);
}
svg path {
	animation: cardAnim 5s cubic-bezier(0.8, 0, 0.2, 1.2) infinite;
}

@keyframes cardAnim {
	0%, 100% {
		fill:tomato;
		d:path('M53.8367971,98.0105931 C62.5709372,90.6149791 66.2112484,87.5325537 70.0435525,83.9893009 C72.7823134,81.4571109 75.6191301,78.6895642 80.4832815,73.9441868 C92.1537616,62.5586791 96.1292776,60.2840306 102.768438,50.2737766 C109.407598,40.2635227 109.562285,19.9893997 97.8949026,8.83310282 C86.2275205,-2.32319407 65.6287893,-3.34048116 53.8367971,12.6102024 C42.7337698,-3.12466085 21.4090627,-3.84487569 8.62341819,8.83310282 C-4.16222634,21.5110813 -0.873759373,43.5215692 6.53796897,53.1409641 C13.9496973,62.7603591 14.192282,61.619107 27.18463,73.9441868 C40.176978,86.2692666 40.176978,86.2692666 53.8367971,98.0105931 Z');
	}

	25% {
		fill:grey;
		d:path('M33.615073,120.257813 C41.8452148,120.257813 58.0737305,120.257812 66.2344717,120.257813 C54.7068699,105.270508 54.7068699,105.270508 54.7068699,86.1914063 C60.3429237,100.47998 89.8928659,98.6647688 97.3043495,78.7348633 C104.715833,58.8049578 92.8137868,46.6757813 78.4317909,30.3862305 C64.049795,14.0966797 64.049795,14.0966797 49.7691932,0 C36.8961464,14.0966797 36.8961464,14.0966797 21.5699745,30.3862305 C6.2438026,46.6757813 -6.36850208,62.7075195 3.49038463,80.6308594 C13.3492714,98.5541992 38.5890174,102.720703 45.0164402,86.1914063 C45.0164402,105.270508 45.0164402,105.270508 33.615073,120.257813 Z');
	}

	50% {
		fill:tomato;
		d:path('M47.0733712,115.058105 C47.4100427,114.390075 51.87634,105.790536 58.6510079,95.6299408 C61.3834707,91.5318141 75.754243,73.4853618 79.5956177,69.3575656 C82.3483693,66.3995627 86.3942962,62.4442739 91.7333984,57.4916992 C85.3540489,53.2612305 76.894088,44.8198242 66.3535156,32.1674805 C55.8129433,19.5151367 49.1927962,8.79264323 46.4930745,0 C41.8278874,10.0341797 34.9431516,20.7566732 25.8388672,32.1674805 C16.7345828,43.5782878 8.12162703,52.019694 0,57.4916992 C10.8533079,66.4956055 19.5749876,74.9956055 26.1650391,82.9916992 C36.0501163,94.9858398 38.2597656,98.434082 47.0733712,115.058105 Z');
	}

	75% {
		fill:grey;
		d:path('M35.3673641,112.529297 C40.8809183,112.529297 51.7540512,112.529297 67.9867628,112.529297 C60.301695,102.53776 56.459161,91.1822917 56.459161,78.4628906 C67.9867628,92.5771484 93.6134579,95.8808594 102.337091,73.9023438 C111.060724,51.9238281 87.0333798,35.1298828 71.9572079,40.6386719 C82.3312313,27.3115234 76.0675595,0 51.6290829,0 C27.1906063,0 20.5890438,28.1669922 31.4425595,40.6386719 C20.8243954,35.4130859 -4.19085428,48.1464371 0.603692268,70.0234375 C5.39823881,91.9004379 31.6515438,97.9189453 46.7687313,78.4628906 C47.9750977,97.1577148 42.9697266,105.318848 35.3673641,112.529297 Z');
	}
}

/* Target chrome only , see http://browserhacks.com/ */
@media all and (-webkit-min-device-pixel-ratio:0) and (min-resolution: .001dpcm) { 
  small {
    display: none;
  }
}
!

JS
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999px

Console