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.
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<div>
<h1>3D Parallax Buttons</h1>
<p>Observe the 3D effect as you scroll around. The larger the monitor you use, the bigger the effect you'll be able to see.</p>
<p></p>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<p>Observe all the sides of the buttons here as you scroll down.</p>
<p>The effect is noticable but not distracting.</p>
<p>Looks great on iOS and Android devices as well.</p>
<p>The JavaScript won't be a performance hit.</p>
<p>However, having a hundred 3D transformed objects will most likely slow down mobile devices and weaker computers so use them wisely.</p>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<button>!</button>
<h2>This title doesn't need JS, just like the <hr>s down below!</h2>
<p>You can use this technique for both inline links and important call to action buttons.</p>
<p>Combining different types also seems to work well:</p>
<button>Fancy Button!</button><br>
<button class="social">
<svg width="17" height="15" xmlns="http://www.w3.org/2000/svg">
<g>
<title>Layer 1</title>
<g id="g2989" transform="matrix(0.0124718 0 0 -0.0124718 27.9323 53.5044)" fill="#00aced">
<path id="path2991" d="m-1372.63623,4272.02979c-125,-45 -204,-160.99951 -195,-287.99951l3,-49l-50,6c-182,23 -341,101 -476.00024,231.99951l-66,65l-17,-48c-36,-106.99951 -13,-219.99951 62,-295.99951c40,-42 31,-48 -38,-23c-24,8 -45,14 -47,11c-7,-7 17,-98 36,-134c26,-50 79,-99 137.00024,-128l49,-23l-58,-1c-56.00024,0 -58.00024,-1 -52.00024,-22c20,-65 99.00024,-134 187.00024,-164l62,-21l-54,-32c-80,-46 -174.00024,-72 -268.00024,-74c-45,-1 -82,-5 -82,-8c0,-10 122,-66 193.00012,-88c213.00012,-65 466.00012,-37 656.00012,74c135,79 270,236 333,388c34,81 67.99994,229 67.99994,300c0,46 3,52 59,107c33,32 64,66.99951 70,76.99951c10,19 9,19 -42,2c-85,-29.99951 -97,-25.99951 -55,19c31,32 68,90 68,107c0,3 -15,-2 -32,-11c-18,-10 -58,-25 -88,-34l-53.99994,-17l-49,33c-27,18 -65,38 -85,44c-51,14 -129,12 -175,-4z" fill="#000000"/>
</g>
</g>
</svg>
</button>
<button class="social">
<svg width="7" height="15" xmlns="http://www.w3.org/2000/svg">
<title>Facebook Home</title>
<g>
<title>Layer 1</title>
<path id="path3857-4" d="m4.92885,0c-2.49491,0 -3.37211,1.26051 -3.37211,3.37858l0,1.55835l-1.55673,0l0,2.59617l1.55673,0l0,7.5331l3.11185,0l0,-7.5331l2.07726,0l0.27481,-2.59617l-2.35207,0l0.00323,-1.2997c0,-0.67724 0.06482,-1.03944 1.0362,-1.03944l1.29809,0l0,-2.59779l-2.07726,0z" mask="none" fill="#000000"/>
</g>
</svg>
</button>
<button class="social">
<svg width="15" height="15" xmlns="http://www.w3.org/2000/svg">
<circle id="svg_4" fill="#000" r="2.05961" cy="12.95838" cx="2.05961"/>
<path id="svg_5" fill="#000" d="m9.95478,15.01799l-2.91778,0a7.037,7.037 0 0 0 -7.037,-7.037l0,-2.91778a9.95478,9.95478 0 0 1 9.95478,9.95478z"/>
<path id="svg_6" fill="#000" d="m12.01439,15.01799a12.01439,12.01439 0 0 0 -12.01439,-12.01439l0,-3.0036a15.01799,15.01799 0 0 1 15.01799,15.01799l-3.0036,0z"/>
</svg>
</button>
<hr />
</div>
@import "compass/css3";
/* button variables */
$bsize: 18px;
$blue: #aad1ee;
$titlefoldsize: 50px;
$animtiming: 80ms steps(20) both;
html {
height: 100%;
overflow: hidden;
background: #777;
}
/* the perspective set here is the most important declaration for the 3d look of the buttons (values over 1000px make the buttons look almost flat) */
body {
margin: 0;
height: 100%;
overflow-y: scroll;
font-family: sans-serif;
font-size: 16px;
perspective: 350px;
}
div {
width: 600px;
margin: 0 auto;
padding: 20px 20px 600px;
background: #fff;
transform-style: preserve-3d;
}
h1, h2 {
text-align: center;
}
h1, h2, hr {
position: relative;
background: #444;
color: #fff;
line-height: 2em;
margin-left: -$titlefoldsize;
margin-right: -$titlefoldsize;
transform-style: preserve-3d;
transform: translateZ(1px);
&::before, &::after {
content:"";
position: absolute;
top: 0;
width: $titlefoldsize;
height: 100%;
background: darken(#444, 10%);
}
&::before {
left: -$titlefoldsize;
transform-origin: 100% 0%;
transform: rotateY(-130deg);
}
&::after {
right: -$titlefoldsize;
transform-origin: 0% 0%;
transform: rotateY(130deg);
}
}
hr {
border: 0;
height: 10px;
background: #444;
}
button {
position: relative;
display: inline-block;
padding: 4px 16px;
border: 0;
min-width: 48px;
margin: 10px;
font-size: 24px;
font-weight: bold;
background-color: $blue;
background-image: radial-gradient(ellipse at top, rgba(255,255,255,0.15) 50%, transparent);
color: #222;
transform-style: preserve-3d;
transform: translateZ( $bsize );
cursor: pointer;
user-select: none;
&:focus {outline: none;}
/* double colon syntax for pseudo elements because IE8 doesn't need to see them (no transforms) */
&::before, &::after {
position: absolute;
width: 100%;
height: 100%;
left: 0;
top: 0;
background: darken($blue, 25%);
transform-origin: 0% 0%;
}
&::before {
content:"";
height: $bsize;
background: darken($blue, 15%);
transform: rotateX(-90deg);
}
&::after {
content:"";
width: $bsize;
transform: rotateY(90deg);
}
&.top-half::before {
top: auto;
bottom: 0;
background: darken($blue, 35%);
transform-origin: 100% 100%;
transform: rotateX(90deg);
}
&.left-half::after {
left: auto;
right: 0;
transform-origin: 100% 100%;
transform: rotateY(-90deg);
}
/* pushing the button down; done with animations with steps because transitions are too buggy and jumpy */
&:active {
animation: button $animtiming;
&::before {
animation: buttonbefore $animtiming;
}
&::after {
animation: buttonafter $animtiming;
}
}
}
@keyframes button {
to { transform: translateZ( $bsize/2 ) }
}
@keyframes buttonbefore {
to { height: $bsize/2; }
}
@keyframes buttonafter {
to { width: $bsize/2; }
}
/* hide pseudo elements in IE9 and IE10 (no 3D transforms) */
@media screen and (min-width:0\0) {
button::before, button::after {
display: none;
}
}
/* hide pseudo elements in non-webkit Opera) */
x:-o-prefocus, button::before, button::after {
display: none;
}
// changing the sides of the button only on load and on browser resize
$(window).on("load resize", function() {
topHalf();
leftHalf();
});
// when scrolling vertically only top and bottom sides need to be recalculated
$("body").scroll(function() {
topHalf();
});
// toggle button class if it's in the top or bottom half of the screen
function topHalf() {
$("button").each(function() {
var self = $(this),
offTop = self.offset().top,
scrTop = $(window).scrollTop(),
halfWindowHeight = ($(window).height())/2;
self.toggleClass("top-half", (offTop - scrTop) < halfWindowHeight);
});
}
// toggle button class if it's in left or right half of the screen
function leftHalf() {
$("button").each(function() {
var self = $(this),
offLeft = self.offset().left,
halfWindowWidth = ($(window).width())/2;
self.toggleClass("left-half", offLeft < halfWindowWidth);
});
}
Also see: Tab Triggers