cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

Code Indentation


Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

              <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Sed voluptates, cupiditate ratione impedit maxime corporis delectus quo consequuntur quis dolorem enim perferendis voluptas sit! Voluptatum soluta corporis harum quam beatae.</p>

<div id="adzone"></div>

<p>Consectetur nam eaque facilis, non consequatur laborum dicta vel autem, omnis unde commodi veniam eligendi quod nostrum quisquam blanditiis dolore? Asperiores odit quasi expedita voluptatum suscipit necessitatibus, amet architecto nemo.</p>
              body {
  max-width: 300px;
  margin: 1rem auto;
p {
  margin: 1rem 0;

#adzone {
  max-height: 0;
  overflow: hidden;
.ad {
  background: lightyellow;
  padding: 1rem;
  p {
    margin: 0;
  img {
    display: block;
    margin: 0 0 1rem 0;

.test-height-element {
  position: absolute;
  top: -9999px;
  left: -9999px;
  padding: 1rem;

// We aren't using this, but if we wanted to go with a mostly-CSS solution, we could apply a class to the ad that used this. It's just not as nice with the magic number in there instead of measuring.
@keyframes slideOpen {
  to {
    max-height: 500px;
    padding: 1rem;
    margin: 0 0 1rem 0;
              // This is already in the DOM. It's where we're gonna drop in the ad.
var adZone = document.querySelector("#adzone");

// Dependency-free Ajax library
  method: 'GET',
  url: 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/3/example-ad.html'
}).then(function(response) {
  // Any DOM manipulation we want to do we can do upfront
  var adHTML = "<div class='ad'>" + response.data + "</div>";
  // The CSS Way (not used in this tutorial)
  // adZone.classList.add("loaded");
  // We're going to do this mostly in JS
  // We need to figure this out!
  var ajaxContentHeight = 0;
  // We need a dummy element
  var testerElement = document.createElement("div");
  // That is exactly as wide as were we're putting the ad
  testerElement.style.width = adZone.offsetWidth;
  // Position it off screen though, nobody needs to see it
  // Temporarily put the ad in there
  testerElement.innerHTML = adHTML;
  // Plop it on the page for a sec
  // If there are any images in it, we need to wait for them to
  // load, otherwise our measuremenets will be off
  imagesLoaded(testerElement, function() {
    // Now we can measure the height!
    ajaxContentHeight = testerElement.offsetHeight + "px";
    // Nuke the dummy element
    // Drop the ad in the real place
    // It's collapsed by default
    adZone.innerHTML = adHTML;
    // Now apply some styles to allow it to transition 
    adZone.style.transition = "1s";
    adZone.style.maxHeight = ajaxContentHeight;
    // After it's done, remove the max height, in case of reflow
    setTimeout(function() {
      adZone.style.maxHeight = "none";
    }, 1001);

Loading ..................