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HTML

About HTML Preprocessors

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

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.

About the <head>

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!
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-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

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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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Packages

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HTML 

              
                <div class="lipsum">
  <p>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean ornare pellentesque dolor in elementum. Aliquam tincidunt justo risus, sed commodo ipsum tempor non. Nunc ex justo, ornare sed tincidunt sit amet, varius non justo. Proin sodales elit et volutpat tempor. Cras convallis bibendum aliquam. Phasellus quis arcu sit amet leo fermentum consequat et scelerisque tortor. Nunc molestie nunc arcu, congue elementum justo pellentesque non. Etiam facilisis diam eu lorem accumsan vestibulum. Suspendisse in mauris ac ante imperdiet imperdiet et ac nulla.
</p>
  <p>
  Suspendisse convallis, nisi in rhoncus aliquet, lacus lorem ullamcorper ipsum, nec varius lacus dolor at massa. Ut non sem eget dui vehicula egestas. Vestibulum et tellus nec ligula placerat lobortis. Cras eget pharetra quam. Maecenas ultrices sem dui, et varius libero tempus et. Sed vehicula vulputate elementum. Phasellus velit massa, accumsan vitae velit sed, consectetur finibus mauris.
</p>
  <p>
  Aliquam ut mollis risus, eu consequat dolor. Sed semper ultrices lectus, quis tempor ante feugiat sit amet. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer turpis elit, sodales ut consectetur at, porttitor quis ligula. Phasellus efficitur ornare velit, sed blandit nisi. Nullam maximus sem in urna egestas fringilla. Sed bibendum, ante id ornare viverra, nulla diam pretium metus, eget ultricies justo turpis vitae mi. Etiam sagittis ex libero, eu iaculis massa fringilla ut.
</p>
  <p>
  Vivamus mattis pulvinar lacus, id porttitor enim convallis vitae. Nunc congue vestibulum magna, ac scelerisque nunc aliquet nec. Vivamus facilisis viverra metus, eget faucibus nisi laoreet eget. Donec mattis hendrerit leo sit amet lobortis. Sed quis augue ac sem euismod tincidunt vel vel mauris. Nam eget nisl eget erat commodo varius in id orci. Nulla egestas dignissim accumsan. Cras mollis diam vel risus semper fermentum. Donec eu ante elementum, ultrices leo ac, tristique velit. Nullam nec mi rhoncus, bibendum nibh a, dapibus nulla. Morbi pretium mi dui.
</p>
  <p>
  Curabitur a fermentum enim. Donec semper sit amet nisl sit amet tristique. Nullam ac rutrum nibh. Phasellus velit tellus, interdum quis eros quis, dignissim molestie nisl. Praesent rhoncus enim et blandit finibus. Cras efficitur tortor nec ex posuere posuere. Curabitur congue enim a posuere malesuada. Morbi mollis vulputate aliquam. Cras sit amet fringilla eros, quis ullamcorper urna. Mauris dignissim felis non ultricies interdum. Nunc hendrerit arcu at justo vulputate ultricies. In faucibus tempor tincidunt. Suspendisse maximus odio et orci viverra pretium.
</p>
</div>

<div class="wrapper">
  <div class="float-left"></div>
  <div class="text">
    <p>
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean ornare pellentesque dolor in elementum. Aliquam tincidunt justo risus, sed commodo ipsum tempor non. Nunc ex justo, ornare sed tincidunt sit amet, varius non justo. Proin sodales elit et volutpat tempor. Cras convallis bibendum aliquam. Phasellus quis arcu sit amet leo fermentum consequat et scelerisque tortor. Nunc molestie nunc arcu, congue elementum justo pellentesque non. Etiam facilisis diam eu lorem accumsan vestibulum. Suspendisse in mauris ac ante imperdiet imperdiet et ac nulla.
    </p>
    <p>
      Suspendisse convallis, nisi in rhoncus aliquet, lacus lorem ullamcorper ipsum, nec varius lacus dolor at massa. Ut non sem eget dui vehicula egestas. Vestibulum et tellus nec ligula placerat lobortis. Cras eget pharetra quam. Maecenas ultrices sem dui, et varius libero tempus et. Sed vehicula vulputate elementum. Phasellus velit massa, accumsan vitae velit sed, consectetur finibus mauris.
    </p>
  </div>
  <div style="clear: both;"></div>
</div>

<div class="lipsum">
  <p>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean ornare pellentesque dolor in elementum. Aliquam tincidunt justo risus, sed commodo ipsum tempor non. Nunc ex justo, ornare sed tincidunt sit amet, varius non justo. Proin sodales elit et volutpat tempor. Cras convallis bibendum aliquam. Phasellus quis arcu sit amet leo fermentum consequat et scelerisque tortor. Nunc molestie nunc arcu, congue elementum justo pellentesque non. Etiam facilisis diam eu lorem accumsan vestibulum. Suspendisse in mauris ac ante imperdiet imperdiet et ac nulla.
</p>
  <p>
  Suspendisse convallis, nisi in rhoncus aliquet, lacus lorem ullamcorper ipsum, nec varius lacus dolor at massa. Ut non sem eget dui vehicula egestas. Vestibulum et tellus nec ligula placerat lobortis. Cras eget pharetra quam. Maecenas ultrices sem dui, et varius libero tempus et. Sed vehicula vulputate elementum. Phasellus velit massa, accumsan vitae velit sed, consectetur finibus mauris.
</p>
  <p>
  Aliquam ut mollis risus, eu consequat dolor. Sed semper ultrices lectus, quis tempor ante feugiat sit amet. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer turpis elit, sodales ut consectetur at, porttitor quis ligula. Phasellus efficitur ornare velit, sed blandit nisi. Nullam maximus sem in urna egestas fringilla. Sed bibendum, ante id ornare viverra, nulla diam pretium metus, eget ultricies justo turpis vitae mi. Etiam sagittis ex libero, eu iaculis massa fringilla ut.
</p>
  <p>
  Vivamus mattis pulvinar lacus, id porttitor enim convallis vitae. Nunc congue vestibulum magna, ac scelerisque nunc aliquet nec. Vivamus facilisis viverra metus, eget faucibus nisi laoreet eget. Donec mattis hendrerit leo sit amet lobortis. Sed quis augue ac sem euismod tincidunt vel vel mauris. Nam eget nisl eget erat commodo varius in id orci. Nulla egestas dignissim accumsan. Cras mollis diam vel risus semper fermentum. Donec eu ante elementum, ultrices leo ac, tristique velit. Nullam nec mi rhoncus, bibendum nibh a, dapibus nulla. Morbi pretium mi dui.
</p>
  <p>
  Suspendisse convallis, nisi in rhoncus aliquet, lacus lorem ullamcorper ipsum, nec varius lacus dolor at massa. Ut non sem eget dui vehicula egestas. Vestibulum et tellus nec ligula placerat lobortis. Cras eget pharetra quam. Maecenas ultrices sem dui, et varius libero tempus et. Sed vehicula vulputate elementum. Phasellus velit massa, accumsan vitae velit sed, consectetur finibus mauris.
</p>
  <p>
  Aliquam ut mollis risus, eu consequat dolor. Sed semper ultrices lectus, quis tempor ante feugiat sit amet. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer turpis elit, sodales ut consectetur at, porttitor quis ligula. Phasellus efficitur ornare velit, sed blandit nisi. Nullam maximus sem in urna egestas fringilla. Sed bibendum, ante id ornare viverra, nulla diam pretium metus, eget ultricies justo turpis vitae mi. Etiam sagittis ex libero, eu iaculis massa fringilla ut.
</p>
  <p>
  Curabitur a fermentum enim. Donec semper sit amet nisl sit amet tristique. Nullam ac rutrum nibh. Phasellus velit tellus, interdum quis eros quis, dignissim molestie nisl. Praesent rhoncus enim et blandit finibus. Cras efficitur tortor nec ex posuere posuere. Curabitur congue enim a posuere malesuada. Morbi mollis vulputate aliquam. Cras sit amet fringilla eros, quis ullamcorper urna. Mauris dignissim felis non ultricies interdum. Nunc hendrerit arcu at justo vulputate ultricies. In faucibus tempor tincidunt. Suspendisse maximus odio et orci viverra pretium.
</p>
</div>


<div id="controls">
  <button type="button" name="debugger">&gt;&gt; DEBUG &lt;&lt;</button>
</div>
!

CSS 

              
                
/* The problem doesn't appear that prevalently on larger screens, so I've limited the body size for this example. */
body {
  margin: 0 auto;
  max-width: 300px;
}

.wrapper {
  border: 2px solid black;
}

.float-left {
  height: 300px;
  width: 200px;
  float: left;
  background-color: lime;
}

.text {
  padding: 1em;
}
!

JS 

              
                
var $text = $('.text');
var tl = new TimelineMax({paused: true});


tl
  .to($text, 2, {
    paddingBottom: calcTextHeight
  });


function calcTextHeight() {
  
  var textInnerHeight = $text.css('position', 'absolute').innerHeight();
  $text.css('position', '');
  
  return textInnerHeight;
}


$('button').click(function(e) {
  
  switch($(this).attr('name')) {
      
    case 'debugger':
      
      calcTextHeight();
      
      break;
  }
  
});
!
999px
What did the HTML say to the CSS? I like your style.

Console