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HTML

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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.

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Adding Classes

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About the <head>

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.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

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.

Vendor Prefixing

About Vendor Prefixing

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-.

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JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <button id="btn1">Click</button>

<div id="test" class="myfont">nec lectus habitant pellentesque vivamus pede ipsum integer pede orci purus tincidunt tempus cras nec eget tincidunt mollis per ipsum sem erat vehicula imperdiet nulla enim est rhoncus nec urna cras malesuada turpis tincidunt quis sagittis vitae justo in ipsum enim velit vitae nisl aliquet ligula mi quas fusce justo velit nunc aliquam nunc ac convallis doloremque sem consequat pellentesque pellentesque inceptos magna eget facilisi non tristique nunc posuere adipiscing mauris feugiat diam sodales penatibus a ullamcorper varius praesent suspendisse dolor ac faucibus ligula reprehenderit ipsum tortor proin quis per eget ac ornare et nostra pharetra nibh orci faucibus mus luctus neque orci occaecat elit fusce nisl commodo tempus fusce non ac est nam pellentesque platea praesent eget tellus integer arcu porta lacus aliquam a ante platea sit est nunc pulvinar interdum vitae mauris minus natoque orci odio est mattis in vel ridiculus mauris consectetuer leo libero posuere lacus vestibulum malesuada amet leo lorem ultricies facilisi aliquam metus anim leo vestibulum wisi at adipiscing libero lacinia quam nec a id suscipit faucibus amet purus vestibulum vitae porttitor dicta sit iaculis donec ultricies enim auctor augue fermentum sapien posuere consectetuer quam elit nonummy nulla eget dictumst ornare at ornare a ipsum ea ut erat nibh adipiscing est suscipit ut at commodo facilisis mollis luctus consectetuer nulla at purus elit eos non risus nam at lacus fringilla phasellus et in quam aenean auctor vehicula dolor porta leo pede quis eaque suscipit amet interdum vel eros rhoncus suspendisse adipiscing semper rutrum justo euismod sollicitudin et ut arcu vel quis condimentum dolor molestias congue condimentum aliquet quis suspendisse pede lacus amet metus pede erat nec nec vestibulum sit fusce porttitor donec pellentesque volutpat sollicitudin vel dapibus sociis lacus adipiscing id amet ullam praesent sed nunc tristique ut sit at et justo lobortis neque aliquam libero consequat pharetra ligula massa sem integer mauris potenti in amet lectus sit eu urna et vitae nulla enim ut consectetuer est convallis at amet orci felis enim maecenas integer lacus ac rutrum malesuada ultrices orci eget amet elementum ac in ante dolor lobortis sit id commodo id ac justo amet in vel vel nec turpis at metus lectus voluptates metus rhoncus orci at rutrum sed praesent amet feugiat amet commodo vitae aliquet sunt turpis non in sapien aliquam at consectetuer amet arcu tellus voluptatem ac metus lacinia potenti adipiscing dapibus nec diam wisi adipiscing est volutpat ornare dignissim nostra diam consectetuer quisque arcu ante felis justo lobortis ut dui bibendum ipsum quam lectus sed ac tempore tortor lorem nonummy suscipit vivamus quis sapien magna placerat est nec risus quisque dolorem nostra a ut diam ultrices nunc turpis mi risus vulputate massa sit orci iaculis suspendisse ipsum ac vel felis ornare eu quis amet scelerisque etiam vitae semper vitae sit dictum integer augue risus praesent nulla suscipit per purus sed penatibus laoreet id sapien lorem convallis scelerisque mollis ligula dolor duis ante metus vestibulum in penatibus vitae sodales urna morbi lorem turpis odio sed natoque amet adipiscing ac quis integer</div>
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CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Shadows+Into+Light);

.myfont
{
  font-family: 'Shadows Into Light', cursive;
  font-size: 25px;
}
!

JS 

              
                var btn1=document.getElementById("btn1");

CSSPlugin.defaultTransformPerspective = 750;

btn1.onclick = function(){
  
  var split;
  
  if(!split){
    split = new SplitText("#test", {type: "lines"});
  }
  
  TweenMax.staggerFrom(split.lines, .3, {
		autoAlpha:0,
     rotationX:75
	}, 0.075);
  
};
!
999px

Console