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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

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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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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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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.

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HTML 

              
                <article>
<h1>
  <em><strong>The Bulowska Headline</strong></em>
</h1>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Culpa obcaecati ad eius exercitationem a nulla quas numquam sint. Eligendi commodi harum modi ratione repellat officiis sit non neque porro excepturi!</p>
<p>Explicabo sunt architecto dignissimos eligendi magnam suscipit commodi ipsa adipisci eius nihil incidunt aut vel rerum deserunt repudiandae nulla quam nostrum voluptatem harum accusamus rem nemo quis aliquid at laboriosam.</p>
<p>Numquam libero dolorem id voluptate iusto sed sapiente iure praesentium accusamus sunt dolore tenetur harum. Totam inventore architecto vitae ratione itaque modi expedita impedit doloremque voluptatum quisquam ullam id deleniti.</p>
<p>Obcaecati sint expedita at ipsa laudantium porro deleniti reprehenderit illo ut ipsum. Autem quos nihil veritatis iste neque sint voluptatibus aliquid optio consectetur quaerat minus maiores minima consequuntur sapiente mollitia!</p>
<h1>
  <strong><em>The Bulowska Headline</em></strong>
</h1>
<h1>
  Regular Headline
</h1>
   
</article>
!

CSS 

              
                /* apply a natural box layout model to all elements */
*, *:before, *:after {
  -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box;
}

@import url(https://fonts.googleapis.com/css?family=Pinyon+Script);
@import url(https://fonts.googleapis.com/css?family=Raleway:400,700);

html {
  font-family: Raleway, sans-serif;
  padding: 6%;
  line-height: 1.6;
}

article {
  text-align: justify;
  max-width: 960px;
  margin: auto;
}

h1 {
  text-transform: uppercase;
  letter-spacing: .1em;
  
  &>em, &>strong {
    font-size: 0;
    text-align: center;
    padding: 0 1em;
    position: relative;
    display: block;

    &:before, &:after { // this is the stroke
      font-size: 1rem;
      content: '';
      display: inline-block;
      vertical-align: middle;
      width: 15%;
      max-width: 7em; // limit the width in really wide containers
      height: 3px;
      background: #000;
      border-radius: 50%;
      position: relative;
      top: -.3em; // adjust this value depending on font used
    }
    
    &>strong, &>em {
      font: normal 3.5rem/1 "Pinyon Script", serif;
      font-style: normal;
      text-transform: none;
      letter-spacing: 0;
      max-width: 70%;
      display: inline-block;
      vertical-align: middle;
      padding: 0 .2em 0;
    }
  }
  
}
!

JS 

              
                // My co-worker created this style of headline that begins and ends with a stroked flourish. I wanted to create this effect with as little extra markup possible for use with Shopify's WYSIWYG (meaning: no custom HTML for non-techies) and work responsively. Unfortunately it doesn't work that great when the headline is broken into multiple lines on small screen devices.
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999px

Console