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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-.

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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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If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

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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.

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HTML 

              
                <p><code>columns:</code> <input type="range" name="columns" min="2" max="4" value="3"> <span>3</span><br>
<code>widows:</code> <input type="range" name="widows" min="1" max="3" value="2"> <span>2</span><br>
<code>orphans:</code> <input type="range" name="orphans" min="1" max="3" value="2"> <span>2</span></p>
<article>
  <h2>Wo wir sind ist vorne</h2>
  <p>Hurenkinder und Schusterjungen kennt man eher aus der klassischen Typographie. Dank <code>columns</code> Property können wir Mehrspaltigkeit aber auch mit CSS erreichen.</p>
  <p><b>Hurenkind</b> (engl. <em>widow</em>) bezeichnet einen Absatz, der einzeln am Anfang einer neuen Spalte oder Seite steht.</p> 
  <p><b>Schusterjunge</b> (engl. <em>orphan</em>) eine Zeile des nächsten Absatzesm dieeinzeln am Ende einer Spalte oder Seite steht.</p>
  <p>Mit den Properties <code>widow</code> und <code>orphans</code> lassen sich diese Zustände beeinflussen.</p>
</article>
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CSS 

              
                article {
  columns: 3;
  widows: 2;
  orphans: 2;
  hyphens: auto;
  text-align: 
}













/*  styles only needed to make the demo more beautiful */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@700&display=swap');

html {
    color: #fff;
    font-family: Montserrat, sans-serif;
    font-size: 1.3rem;
    height: 100%;
}

body {
    background-image: linear-gradient( 
-170deg, rgba(35, 16, 21, 0.7) 0%, rgba(240, 63, 103, 0.5) 100%), url(https://wowirsindistvorne.show/wp-content/themes/wwsiv/img/andre-benz-JBkwaYMuhdc-1800-compress-or-die.jpg);
    background-size: cover;
    background-position: 50% 100%;
    height: 100;
    margin: 0;
    padding: 2em 12%;
}

h2 {
  margin: 0 0 1em;
}
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JS 

              
                

















/** only needed for the demo **/
const article = document.querySelector('article');
document.querySelectorAll('input[type="range"]').forEach( r => {
   r.addEventListener('input', event => {
     article.style[event.target.name] = event.target.nextElementSibling.textContent = event.target.value;
   });
});
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999px

Console