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 Skypack, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ES6 import
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="grid">
<header>
Header
</header>
<aside class="sidebar-left">
Left Sidebar
</aside>
<article>
Article
<div>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Architecto, magni. Nihil impedit mollitia provident est inventore vero explicabo quam, illum tenetur quidem dolor rerum debitis odit dicta libero error, amet nulla fuga similique necessitatibus temporibus ipsam facere ad? Ipsam enim quaerat laborum at vel, odit quo repellendus. Quae magni fugiat necessitatibus inventore ex! At id voluptates recusandae voluptatibus autem explicabo doloremque asperiores. Dolores quia distinctio sit ad enim omnis aut deleniti fugit, laudantium, commodi animi veritatis in quos eum inventore est eaque natus laborum, neque voluptas! Excepturi ex autem, porro ab fuga esse animi officiis beatae rem repellat libero, tenetur debitis a aperiam quidem ea iste et? Laudantium libero enim eaque sit repellendus facere, id minima maxime optio nesciunt explicabo consequatur beatae neque tempora velit autem eos illum obcaecati incidunt! Eum modi consequatur iure explicabo repudiandae adipisci quasi architecto, ex molestias labore at nobis obcaecati voluptatibus dolore dolor alias quis quam. Cum iste itaque tempora aspernatur excepturi voluptatum ipsam molestiae eligendi recusandae, nemo repellat dicta odit nesciunt quisquam sunt accusamus error voluptatem molestias, voluptatibus aliquam. Vel culpa dicta molestiae omnis impedit aliquid perferendis hic earum vero beatae, excepturi veritatis accusantium quas quo debitis deserunt. Ab assumenda esse illum quo cum! At corporis dignissimos aut atque enim consectetur distinctio et reprehenderit ad aliquam. Alias ea eligendi illo accusantium ipsam. Veniam, excepturi natus eaque, iusto quas earum facilis est enim illum deserunt, vitae maxime ex? Itaque rem optio facere cumque odio neque nisi sunt velit veniam dolorum ex sed id asperiores reprehenderit, quidem harum error totam atque dolor. Hic veniam culpa placeat tempora esse, quas pariatur, iure voluptate cumque soluta corrupti consequuntur. Aliquid numquam nesciunt corporis fuga, eligendi temporibus est tempora error quod nostrum non dolorem alias asperiores doloribus iusto recusandae cupiditate dolore cum incidunt, fugit reiciendis similique delectus doloremque velit. Libero magni ex quod enim vel at maxime dolorem autem, quam eos necessitatibus quidem velit quasi cum perferendis consequuntur, optio exercitationem quisquam reiciendis rerum explicabo facilis totam nostrum eligendi. Dolor hic nostrum accusamus eum totam non ut harum ipsa pariatur tenetur aliquam, eos dignissimos animi qui debitis nobis possimus ad labore ex magnam. Delectus alias aut in nobis consequatur minus neque optio eius facilis possimus perferendis eveniet impedit fugit dolores rem sapiente, cumque aliquid. Odit minus saepe, numquam cumque animi nihil eos! Dicta beatae laudantium sunt error in ducimus laborum ea voluptate cum voluptatum alias, maxime ipsa nisi rem, illum officiis.</div>
</article>
<aside class="sidebar-right">
Right Sidebar
</aside>
<footer>
Footer
</footer>
</div>
* { margin: 0; padding: 0; box-sizing: border-box; } ::before, ::after { box-sizing:inherit; }
body {
text-align: center;
height:100vh;
}
.grid {
height:100%;
max-height:100%;
display: grid;
grid-template-columns: 150px 1fr 150px;
grid-template-rows: auto minmax(0, 1fr) auto;
grid-gap: 4px;
min-height:0;
}
header,
aside,
article,
footer {
background: #ccc;
padding: 1em;
}
header {
/* Start on Row 1 */
grid-row: 1;
/* Start on the first column line and extend all the to the last column line */
grid-column: 1 / 4;
}
.sidebar-left {
/* Start on Row 2 */
grid-row: 2;
/* Start on the first column line and stop at the next column line */
grid-column: 1 / 2;
}
article {
/* Start on Row 2 */
grid-row: 2;
/* Start on the second column line and stop at the third column line */
grid-column: 2 / 3;
overflow:auto;
}
article div {
background: white;
}
.sidebar-right {
/* Start on Row 2 */
grid-row: 2;
/* Start on the third column line and stop at the last column line */
grid-column: 3 / 4;
}
.sidebar-right div {
background: white;
height: 350px;
}
footer {
/* Start on Row 1 */
grid-row: 3;
/* Start on the first column line and extend all the to the last column line */
grid-column: 1 / 4;
}
Also see: Tab Triggers