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.
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.
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.
The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.
CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.
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.
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).
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.
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.
JavaScript preprocessors can help make authoring JavaScript easier and more convenient.
Babel includes JSX processing.
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.
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.
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.
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.
If active, Pens will autosave every 30 seconds after being saved once.
If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.
If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.
Visit your global Editor Settings.
<div class="wrapper">
<div class="header"></div>
<div class="content-container"></div>
</div>
<!-- Content -->
<div class="main-content">
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Expedita quam beatae libero architecto unde quo distinctio quisquam vel voluptas cum consequuntur tenetur eveniet est voluptatibus maxime excepturi amet. Aut adipisci accusantium eveniet dicta magni asperiores nisi officiis dolor a nemo possimus necessitatibus nobis voluptatum qui consectetur molestiae nesciunt libero nihil! Culpa doloribus dignissimos quod cum sapiente eius suscipit unde nihil a deserunt! Odio accusantium itaque voluptas ex quam ad a molestiae ducimus nihil cupiditate et animi voluptatem cum! Soluta quas eius fugit illo non nulla facilis nobis molestiae vero facere. Provident sequi officiis tenetur ab voluptatum vitae cupiditate sint quis!</p>
<p>Culpa architecto rem velit quibusdam accusamus tempore sequi iste molestias corrupti dolores qui veniam sunt eveniet consequatur eius quas suscipit. Eius ipsa praesentium debitis illo dicta ducimus accusantium modi iure mollitia sed unde possimus a cupiditate enim officiis ex neque. Porro minima dignissimos voluptas nihil unde fugiat dolores numquam accusamus! Ullam quasi non a totam voluptatem libero necessitatibus quaerat fuga reiciendis quas dolorem numquam. Ullam dolorem ipsa modi eos placeat illo recusandae provident molestias ex soluta deserunt delectus voluptatibus atque aliquid odit a numquam tempore iure porro aliquam doloribus asperiores quisquam maiores. Debitis blanditiis quia ab quidem repellendus nulla ducimus.</p>
<p>Autem animi possimus dolore eaque nemo unde dolorum minima. Minus porro voluptatum illum temporibus in expedita doloremque labore nam architecto perferendis suscipit ad. Minus fuga velit dolor quibusdam totam eum nisi natus sint expedita cupiditate. Adipisci consequatur quisquam quam maxime libero similique nisi unde sint. Placeat illo laborum maxime suscipit voluptate culpa assumenda reiciendis aut cupiditate perspiciatis itaque nostrum quaerat sed iusto eveniet. Beatae impedit distinctio tempora at nostrum deleniti. Adipisci fugiat excepturi veritatis vitae molestias laboriosam aspernatur minus. Soluta nemo facilis eveniet ut vero consequuntur aliquam nulla ducimus eum sit. Voluptas sed inventore maxime est cum explicabo aperiam porro.</p>
<p>Cum accusantium amet et modi ullam neque id suscipit provident nulla sapiente sed placeat veritatis corrupti nostrum fuga soluta dolores praesentium odio accusamus corporis adipisci sit quidem dignissimos vero maiores! Consectetur iure animi placeat soluta neque delectus cumque recusandae quod impedit laborum magni velit molestias iste commodi ratione quasi perspiciatis. Obcaecati itaque est consequatur reprehenderit enim quaerat autem minima aspernatur inventore soluta odit quisquam voluptatem explicabo nesciunt necessitatibus qui odio amet pariatur laboriosam ab officiis ipsum vel aliquid libero vero numquam quod error ipsa fuga repellendus tempora dolorem dolorum doloremque illum cupiditate ea possimus accusamus incidunt magni cum aperiam reiciendis!</p>
<p>Magni harum molestiae eveniet doloremque adipisci dicta exercitationem! Ab quia nobis aspernatur deleniti alias voluptatem libero ipsum magnam nihil vel quam architecto mollitia. Dicta quidem eveniet cumque eligendi doloremque praesentium quos nulla sed nihil repellendus reprehenderit mollitia repudiandae corporis nemo earum optio debitis officia amet reiciendis quaerat commodi dolore exercitationem eos saepe quae. Esse voluptas laboriosam eaque consectetur unde autem dolores odit repellendus perferendis aut blanditiis enim! Sit quam unde similique maxime delectus blanditiis quia totam ullam minus deleniti labore necessitatibus commodi dignissimos reprehenderit autem id ipsa maiores suscipit eius obcaecati asperiores reiciendis repudiandae voluptatum explicabo odio eveniet corporis odit.</p>
</div>
.main-content{
box-sizing:border-box;
flow-into:content;
/* Adding fixed height and scrolling*/
height:500px;
overflow-y:auto;
/* Translating up by the height of the .header */
transform:translateY(-50px);
/* Accommodate for the translateY */
padding-top:50px;
}
.wrapper{ /* Just center it */
width:500px;
margin:0 auto;
}
.header{
height: 50px; /* Height of the Header */
-webkit-filter:blur(5px);
}
.content-container{
height:500px;
}
.header,
.content-container{
flow-from:content;
}
Also see: Tab Triggers