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>
<!doctype html>
<!doctype html>
<svg viewBox="114.551 81.194 134.814 113.214">
<g class="sparkles">
<path style="--duration: 1.9s; --delay: 0s; fill: rgb(31, 162, 49);" d="M 143.21 131.761 C 143.21 131.761 144.398 125.559 145.453 131.761 C 145.453 131.761 151.391 132.816 145.453 133.872 C 145.453 133.872 144.398 140.206 143.21 133.872 C 139.647 133.212 139.911 132.553 143.21 131.761 Z"></path>
<path style="--duration: 3s; --delay: 0s; fill: rgb(31, 162, 49);" d="M 164.499 98.461 C 164.499 98.461 165.237 94.608 165.893 98.461 C 165.893 98.461 169.582 99.116 165.893 99.772 C 165.893 99.772 165.237 103.707 164.499 99.772 C 162.286 99.362 162.45 98.952 164.499 98.461 Z"></path>
<path style="--duration: 1.6s; --delay: 0s; fill: rgb(31, 162, 49);" d="M 245.112 190.116 C 245.112 190.116 246.146 184.713 247.066 190.116 C 247.066 190.116 252.239 191.035 247.066 191.955 C 247.066 191.955 246.146 197.473 245.112 191.955 C 242.008 191.38 242.238 190.806 245.112 190.116 Z"></path>
<path style="--duration: 3.4s; --delay: 0s; fill: rgb(31, 162, 49);" d="M 150.284 174.329 C 150.284 174.329 151.022 170.476 151.678 174.329 C 151.678 174.329 155.367 174.984 151.678 175.64 C 151.678 175.64 151.022 179.575 150.284 175.64 C 148.071 175.23 148.235 174.82 150.284 174.329 Z"></path>
<path style="--duration:2.5s; --delay: 0s; fill: rgb(31, 162, 49);" d="M 224.246 96.605 C 224.246 96.605 224.984 92.752 225.64 96.605 C 225.64 96.605 229.329 97.26 225.64 97.916 C 225.64 97.916 224.984 101.851 224.246 97.916 C 222.033 97.506 222.197 97.096 224.246 96.605 Z"></path>
<path style="--duration: 3.9s; --delay: 0s; fill: rgb(31, 162, 49);" d="M 202.166 155.219 C 202.166 155.219 203.354 149.017 204.409 155.219 C 204.409 155.219 210.347 156.274 204.409 157.33 C 204.409 157.33 203.354 163.664 202.166 157.33 C 198.603 156.67 198.867 156.011 202.166 155.219 Z"></path>
</g>
</svg>
</div>
svg {
z-index: 1;
width: 50vw;
max-width: 40rem;
height: auto;
}
.sparkles path {
transform-origin: 50% 50%;
transform-box: fill-box;
animation: sparkle var(--duration) var(--delay) infinite ease-in-out;
}
@keyframes sparkle {
0% {
transform: scale(0);
}
50% {
transform: scale(0);
}
70% {
transform: scale(-1, 0);
}
80% {
transform: scale(1);
}
100% {
transform: scale(0);
}
}
Also see: Tab Triggers