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.
<section class="section-notification">
<ul class="nav">
<li><i class="material-icons">home</i>
</li>
<li><i class="material-icons">search</i>
</li>
<li class="is-active"><i class="material-icons">star
<ul class="notifications">
<li><i class="material-icons">remove_red_eye</i><span>9</span>
</li>
<li><i class="material-icons">comment</i><span>4</span>
</li>
<li><i class="material-icons">account_circle</i><span>6</span>
</li>
</ul></i>
</li>
<li><i class="material-icons">face</i>
</li>
</ul>
</section>
@import 'nib'
greenlight = #01cfa9
flex(n)
display: n
font()
font-family 'Roboto',sans-serif
body
font()
font-smoothing antialiased
height 100vh
section
background greenlight
height 100vh
margin 0 auto
flex(flex)
justify-content center
align-items center
.section-notification
.nav
flex(flex)
background #fff
color #333
border-radius 5px
box-shadow 0px 23px 30px -20px rgba(black, .3)
padding 0
.nav > li
padding 20px 30px
width 24px
height @width
cursor pointer
list-style none
color rgba(black, .5)
relative()
perspective 1000px
&:last-child
//border-right none
&:hover
background #eee
&.is-active
box-shadow 0px -7px 0px #05a285 inset
background #dfdfdf
color #333
transition .3s ease
.notifications
flex(flex)
animation note .7s ease-in-out forwards
transform-origin center 60px
@keyframes note
0%
opacity 0
transform scale(.1) rotate(30deg) translateY(50px)
rotateX(90deg)
50%
transform rotate(-10deg)
opacity 1
70%
transform rotate(5deg)
100%
transform scale(1)
.notifications
list-style none
background #05a285
flex(none)
border-radius 4px
absolute bottom 100% left 50%
padding 0px 10px
margin 0 0 10px -88px
cursor default
color white
&:after
absolute top 100% left 50%
border solid transparent
content " "
height 0
width @height
border-top-color #05a285
border-width 16px
margin-left -16px
pointer-events none
li
padding 6px
font()
color white
font-size .6em
.material-icons
font-size 24px
span
display inline-block
vertical-align top
margin 4px
var elems =document.getElementsByClassName("nav")[0].getElementsByTagName("li");
for (var i = 0; i < elems.length; i++) {
elems[i].addEventListener("click", function (e) {
for (var i = 0; i < elems.length; i++) {
elems[i].className="";
};
this.className = "is-active";
});
}
Also see: Tab Triggers