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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

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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

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

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Babel includes JSX processing.

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HTML 

              
                <h1 class="codepen">Windows 8 style modal</h1>
<div class="codepen">
  <button onclick="modal('hello there.')">Plain text example</button>
</div>
<p class="codepen">
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse est augue, fringilla et est ut, egestas varius nisi. Nam quis arcu bibendum, elementum dui non, molestie arcu. Proin rhoncus semper orci, at porttitor leo placerat nec. Mauris tristique sem ac ultricies cursus. Sed pulvinar urna justo, ac bibendum nibh mattis sit amet. Phasellus sed lectus nunc. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Phasellus at ante sollicitudin, ornare erat a, adipiscing ligula. Aenean vel malesuada quam. Nunc consequat sodales est, eu vestibulum odio tristique eget. Nulla facilisi. Nam elit nisi, bibendum non lacus eu, elementum tincidunt quam.
</p>
<div class="codepen">
  <button onclick="modal('<h4>Look i\'m HTML</h4><ul><li>Hello</li><li>Hello</li><li>Hello!</li></ul>')">HTML example</button>
</div>
<p class="codepen">
Praesent et dolor sed nulla egestas condimentum. Morbi ut porttitor dui. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Donec posuere arcu quis ultricies blandit. Pellentesque malesuada feugiat arcu eget auctor. Quisque adipiscing lacus urna, et vulputate nibh mollis ut. In tincidunt magna ut ipsum ultricies sodales. Phasellus sagittis odio odio, sit amet faucibus risus venenatis eget. Pellentesque id orci eleifend lectus porta pharetra. Maecenas non est lorem. Suspendisse sed pellentesque arcu. Fusce semper, sem id malesuada pretium, mauris nulla pretium enim, id pulvinar lorem ipsum et metus.
</p>
<p class="codepen">
Quisque semper, leo quis posuere vulputate, nisl est laoreet neque, quis lacinia libero risus laoreet elit. Donec malesuada urna at aliquam pellentesque. Donec ultrices risus eu risus pellentesque, id dictum nulla vulputate. Vestibulum at pretium ligula, a ullamcorper risus. Cras auctor urna eu dolor elementum, nec aliquet nulla molestie. Nulla ultricies lectus eget libero convallis cursus. Suspendisse vulputate facilisis metus, et volutpat mauris dictum a. Morbi fermentum massa id lacus molestie molestie. Suspendisse mollis dolor ut lectus rutrum varius. Suspendisse sed scelerisque lacus. Nam vehicula, neque eget dictum tristique, felis nisl dapibus nunc, a lobortis eros felis ut purus. Cras congue arcu nibh, pellentesque feugiat nibh aliquet et.
</p>
<p class="codepen">
Sed vitae molestie metus. Morbi quis laoreet urna, id tempor augue. Nullam sit amet mi tellus. Donec hendrerit molestie odio, non pretium est tempus non. Pellentesque quam risus, consequat vel sapien porta, commodo suscipit sem. Cras consequat volutpat arcu, ultrices auctor augue porta sit amet. Ut arcu neque, fringilla eget auctor vel, commodo a diam. Proin dolor dolor, consequat sodales nisl a, pulvinar pulvinar lacus. Nam tempor libero non nisl luctus consectetur.
</p>
<p class="codepen">
Cras vestibulum, magna ac accumsan dapibus, velit lorem semper dui, in feugiat sem neque sit amet metus. Vivamus condimentum nunc nulla, quis tincidunt urna volutpat sed. Donec pretium velit in turpis blandit auctor. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Fusce dapibus lacinia tincidunt. Sed sed elit vel ipsum ultricies vulputate at sed ipsum. Quisque dignissim malesuada ligula, nec euismod eros hendrerit nec. 
</p>
!

CSS 

              
                .modal-table{
  position: fixed;
  width: 100%;
  height: 100%;
  top: 0;
  display: table;
}

.modal-cell{
  display: table-cell; 
  vertical-align: middle;
  background: rgba(0,0,0,0.90);
}

.modal-bar{
  width: 100%;
  background: #0f8845;
  color: white;
  /*margin: 0 auto;*/
}

.modal-content{
  width: 50%;
  padding: 1em;
  margin: 0 auto;
  position: relative;
}

.modal-content button{
  bottom: 1em;
  right: 1em;
  position: absolute;
}

/* Irrelevent styling */
@font-face{
  font-family: 'Open Sans Light';
  src: local('Open Sans'), local('OpenSans'), url(http://themes.googleusercontent.com/static/fonts/opensans/v8/cJZKeOuBrn4kERxqtaUH3T8E0i7KZn-EPnyo3HZu7kw.woff) format('woff');
}

body { height: 1000px; } /* Just to see scrolling working */

body{
  margin: 0;
  font-family: Open Sans;
}

*{ font-weight: lighter; }

.codepen{ 
  text-align: center; 
  font-weight: lighter;
  width: 50%;
  margin: 10px auto;
}

button
{
  border: 1px solid whitesmoke;
  color: white;
  background: #0f8845;
  padding: .25em .5em;
  cursor: pointer;
}
button:hover{
  background: #0da24e;
}
!

JS 

              
                var modal = function(html)
{

  var modal_table   = $('<div />')    .addClass('modal-table'),
      modal_cell    = $('<div />')    .addClass('modal-cell')
                                      .appendTo(modal_table),
      modal_bar     = $('<div />')    .addClass('modal-bar')
                                      .appendTo(modal_cell),
      modal_content = $('<div />')    .addClass('modal-content')
                                      .html(html)
                                      .appendTo(modal_bar),
      button        = $('<button />') .appendTo(modal_content)
                                      .text("Okay")
                                      .click(function(){
                                        modal_table.remove();
                                      });

  $('body').append(modal_table);

}
  
modal("Hello");
!
999px

Console