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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

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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 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.

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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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HTML 

              
                <article>
<p>Toad-like smile Flourish and Blotts he knew I’d come back Quidditch World Cup. Fat Lady baubles banana fritters fairy lights Petrificus Totalus. So thirsty, deluminator firs’ years follow me 12 inches of parchment. Head Boy start-of-term banquet Cleansweep Seven roaring lion hat. Unicorn blood crossbow mars is bright tonight, feast Norwegian Ridgeback. Come seek us where our voices sound, we cannot sing above the ground, Ginny Weasley bright red. Fanged frisbees, phoenix tears good clean match.</p>
  
<figure>
  <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/72/Omega_Nebula.jpg/591px-Omega_Nebula.jpg" width="100%">
</figure>

<p>Thestral dirigible plums, Viktor Krum hexed memory charm Animagus Invisibility Cloak three-headed Dog. Half-Blood Prince Invisibility Cloak cauldron cakes, hiya Harry! Basilisk venom Umbridge swiveling blue eye Levicorpus, nitwit blubber oddment tweak. Chasers Winky quills The Boy Who Lived bat spleens cupboard under the stairs flying motorcycle. Sirius Black Holyhead Harpies, you’ve got dirt on your nose. Floating candles Sir Cadogan The Sight three hoops disciplinary hearing. Grindlewald pig’s tail Sorcerer's Stone biting teacup. Side-along dragon-scale suits Filch 20 points, Mr. Potter.</p>

<p>Squashy armchairs dirt on your nose brass scales crush the Sopophorous bean with flat side of silver dagger, releases juice better than cutting. Full moon Whomping Willow three turns should do it lemon drops. Locomotor trunks owl treats that will be 50 points, Mr. Potter. Witch Weekly, he will rise again and he will come for us, headmaster Erumpent horn. Fenrir Grayback horseless carriages ‘zis is a chance many would die for!</p>

<p>Boggarts lavender robes, Hermione Granger Fantastic Beasts and Where to Find Them. Bee in your bonnet Hand of Glory elder wand, spectacles House Cup Bertie Bott’s Every Flavor Beans Impedimenta. Stunning spells tap-dancing spider Slytherin’s Heir mewing kittens Remus Lupin. Palominos scarlet train black robes, Metamorphimagus Niffler dead easy second bedroom. Padma and Parvati Sorting Hat Minister of Magic blue turban remember my last.</p>

<p>Red hair crookshanks bludger Marauder’s Map Prongs sunshine daisies butter mellow Ludo Bagman. Beaters gobbledegook N.E.W.T., Honeydukes eriseD inferi Wormtail. Mistletoe dungeons Parseltongue Eeylops Owl Emporium expecto patronum floo powder duel. Gillyweed portkey, keeper Godric’s Hollow telescope, splinched fire-whisky silver Leprechaun O.W.L. stroke the spine. Chalice Hungarian Horntail, catherine wheels Essence of Dittany Gringotts Harry Potter. Prophecies Yaxley green eyes Remembrall horcrux hand of the servant. Devil’s snare love potion Ravenclaw, Professor Sinistra time-turner steak and kidney pie. Cabbage Daily Prophet letters from no one Dervish and Banges leg.</p>
</article>
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CSS 

              
                img {
  display: block;
  -webkit-clip-path: polygon(0% 0%, 100% 0%, 100% 75%, 75% 75%, 75% 100%, 50% 75%, 0% 75%);
  clip-path: polygon(0% 0%, 100% 0%, 100% 75%, 75% 75%, 75% 100%, 50% 75%, 0% 75%);
}

figure {
  padding: 0;
  margin: 0;
  width: 100%;
}


article {
  columns: 2;
  column-gap: 2em;
  padding: 2em;
  max-width: 800px;
  margin: 0 auto;
}

article > p:first-child {
  margin-top: 0;
}
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JS
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999px

Console