Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

Add External Scripts/Pens

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.

+ add another resource

Behavior

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.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <!-- To use WebP images in normal HTML, just replace the image URL with that of your image, and the CSS class with your own class. -->

<h1>WEBP IMAGE DISPLAYED IN HTML</h1>

<picture>
  <source srcset="https://www.carmenhchung.com/images/carmen-chung.webp" type="image/webp" class="first-image">
  <source srcset="https://www.carmenhchung.com/images/carmen-chung.jpg" type="image/jpeg" class="first-image">
  <img alt="This is my face" src="https://www.carmenhchung.com/images/carmen-chung.jpg" class="first-image">
</picture>

<!-- Only do the following steps if you want to use an image inside a CSS class (e.g. as a backgroung image). -->

<!-- First, download Modernizr and save it to your directory. Refer to the location of your downloaded Modernizr script like below: -->

<script src="https://www.carmenhchung.com/modernizr-custom.js"></script>

<!-- Second, add the below command in to check if the user's browser supports WebP images: -->

<script>
  Modernizr.on('webp', function(result) {
    if (result) {
      // supported
    } else {
      // not-supported
    }
  });
</script>

<!-- Third, add a "no-js" class to every component in the event that the user's browser does not support Javascript (see JS file): -->

<html class="no-js">

<!-- Finally, display your actual class with the background image (see CSS file): -->
<h1>WEBP IMAGE DISPLAYED IN CSS</h1>
<div class="container"></div>
              
            
!

CSS

              
                h1 {
  font-family: "Exo", sans-serif;
  text-align: center;
  color: #ffd700;
}

.first-image {
  width: 100%;
}

.no-js .container {
  background-image: url("https://www.carmenhchung.com/images/carmen-chung-profile.png");
  background-size: 20%;
  background-repeat: no-repeat;
  height: calc(100vh);
  vertical-align: center;
  display: block;
  background-color: white;
  background-position: center top;
}

.no-webp .container {
  background-image: url("https://www.carmenhchung.com/images/carmen-chung-profile.png");
  background-size: 20%;
  background-repeat: no-repeat;
  height: calc(100vh);
  vertical-align: center;
  display: block;
  background-color: white;
  background-position: center top;
}

.webp .container {
  background-image: url("https://www.carmenhchung.com/images/carmen-chung-profile.webp");
  background-size: 20%;
  background-repeat: no-repeat;
  height: calc(100vh);
  vertical-align: center;
  display: block;
  background-color: white;
  background-position: center top;
}

              
            
!

JS

              
                // The Javascript here is only necessary if you have an image inside of a CSS class.

// Check that the user's browser supports Javascript by removing the no-js class if it does support Javascript:
document.documentElement.classList.remove("no-js");

              
            
!
999px

Console