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HTML

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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).

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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.

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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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HTML 

              
                <article class="content">

<p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Fugit corrupti perferendis quod laborum explicabo ratione quidem laudantium officia odit vitae, quisquam ullam aliquid voluptate consequatur eos quis ducimus, repellat aperiam.</p>
<p>Hic tenetur modi explicabo itaque incidunt, obcaecati fugiat consequuntur asperiores aliquid, eius, atque ullam unde. Aut et molestias eaque repudiandae!</p>
  <h2>Consectetur adipisicing elit</h2>
<p>Aliquam repudiandae quod suscipit rerum nihil ipsum magni tempora hic amet consequuntur ipsam tenetur possimus a, iure placeat deleniti voluptatibus earum. Tempore quisquam eligendi beatae consequatur a harum ea dolorem.</p>
  <p>Quos nulla ipsam nemo iusto beatae reprehenderit repellat soluta, doloribus facere. Ab veritatis nihil cumque? Eaque debitis placeat exercitationem veritatis?.</p>
  <p>Vel amet in magni perferendis tempore atque, velit dolor illum totam repellendus. Reiciendis, quas.</p>
<h2>Maiores ullam in praesentium</h2>
<figure>
  <img src="https://source.unsplash.com/5I_Lf_xy9Pw/2400x1823">
  <figcaption>Hey, this is a bee!</figcaption>
</figure>
<p>Amet atque iusto ipsum explicabo sed quasi quas possimus suscipit nemo quam dolorum ex voluptas eligendi cumque quidem perferendis tempore impedit maiores. Dicta, quam laudantium?</p>
<p>Reprehenderit, libero, delectus dolor cupiditate voluptate in, animi vitae necessitatibus non ab totam! Eos quia, natus quidem perferendis iste debitis sint eius tempore accusamus vitae dolorum voluptas obcaecati similique! Reiciendis?</p>
<figure>
  <img src="https://source.unsplash.com/W_TPved6SLA/2400x1823">
  <figcaption>Hey, this is a bee!</figcaption>
</figure>
<p>Accusantium praesentium, atque commodi voluptatum eveniet hic nihil nulla doloribus! Voluptates rem cupiditate, molestias expedita facilis id voluptate? Ipsam dignissimos praesentium nulla earum non magnam rerum dolore quod optio libero.</p>
<p>Libero unde, provident id saepe aspernatur, quia debitis incidunt accusamus impedit expedita repudiandae assumenda. Incidunt sapiente et illo, quidem deserunt porro. Nobis ab quidem quod, in fuga vitae a suscipit.</p>
<p>Dicta consequuntur ea, ullam numquam eum explicabo? Tempore commodi aperiam ex dolor modi, vitae repudiandae vero in ratione! Iusto dignissimos enim veritatis error voluptas obcaecati sed impedit, tenetur non sit.</p>
<h3>Amet soluta, ratione quam quis. Molestiae, doloribus.</h3>
<p>Officiis deserunt amet expedita pariatur iure sequi ad facere temporibus explicabo tempora vero dolor vel hic veniam obcaecati, sapiente inventore sit non perspiciatis necessitatibus. Quidem atque pariatur et sequi nulla.</p>
<p>Voluptates expedita a ea nihil ex! Minima reprehenderit recusandae minus obcaecati, distinctio ex tempora doloremque consequatur iste! Debitis, numquam, quibusdam veniam quasi, consectetur tenetur quam explicabo laboriosam et placeat facere?</p>
<p>Ipsum reprehenderit aliquid nisi distinctio molestiae illo recusandae hic, quod vero minus sunt neque, repudiandae officia iusto rerum laudantium voluptatem quibusdam nihil id enim impedit adipisci asperiores. Reiciendis, pariatur placeat!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Repudiandae impedit fugiat voluptas totam debitis quasi unde accusamus voluptatum dolorum odio excepturi cupiditate obcaecati quibusdam beatae reprehenderit tenetur sit, corporis est!</p>
  
</article>
!

CSS 

              
                :root {
  font-size: 112.5%;
}

body {
  padding: 4em;
  margin: 0 auto;
  max-width: 60ch;
  font: 1em/1.618 sans-serif;
  color: #444;
}

img {
  max-width: 100%;
  border-radius: 0.5em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: 1.3;
  margin: 1.5em 0 1.5rem;
  color: #111;
}

pre,
figure,
blockquote {
  margin: 3em 0;
}

figcaption {
  margin-top: 1em;
  font-size: 0.75em;
  color: #888;
  text-align: center;
}

p {
  margin: 0;
  &:not(:last-child) {
    margin-bottom: 1.5em;
  }
}

@supports (selector(html:has(body))) {
  h2:has(+ figure, + code, + blockquote) {
    margin-bottom: -1.5rem;
  }
}
@supports not (selector(html:has(body))) {
  body:before {
    padding: 1em;
    color: red;
    display: block;
    content: "Your browser doesn't support the `:has()` pseudo-class yet.";
  }
}
!

JS
!
999px

Console