Pen Settings

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>

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-.

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

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

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About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

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+ add another resource

JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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.

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About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

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About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

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 

              
                <button onclick="zoom('450px')">Zoom 50%</button>
<button onclick="zoom('600px')">Zoom 100%</button>
<button onclick="zoom('150px')">Zoom -50%</button>
<button onclick="zoom('300px')">Reset Zoom</button>
<b>Note! Every image has a tooltip that says the quality and saving when hover over the image.</b>
<hr>
<img src="https://www.peterbe.com/guetzli/origin/59_300x300.jpg" title="Original, 22,296 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/59_300x300.jpg" title="Quality 85, 8,315 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/59_300x300.jpg" title="Quality 90, 5,776 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/59_300x300.jpg" title="Quality 95, 2,854 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/59_300x300.jpg" title="Quality 99, 1,250 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/59_300x300.jpg" title="Quality 100, 1,010 Bytes smaller">
<hr>
<img src="https://www.peterbe.com/guetzli/origin/144_300x300.jpg" title="Original, 16,042 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/144_300x300.jpg" title="Quality 85, 6,100 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/144_300x300.jpg" title="Quality 90, 4,234 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/144_300x300.jpg" title="Quality 95, 2,076 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/144_300x300.jpg" title="Quality 99, 691 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/144_300x300.jpg" title="Quality 100, 513 Bytes smaller">
<hr>
<img src="https://www.peterbe.com/guetzli/origin/522_300x300.jpg" title="Original, 24,945 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/522_300x300.jpg" title="Quality 85, 6,862 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/522_300x300.jpg" title="Quality 90, 4,702 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/522_300x300.jpg" title="Quality 95, 2,068 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/522_300x300.jpg" title="Quality 99, 632 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/522_300x300.jpg" title="Quality 100, 453 Bytes smaller">
<hr>
<img src="https://www.peterbe.com/guetzli/origin/664_300x300.jpg" title="Original, 27,413 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/664_300x300.jpg" title="Quality 85, 7,831 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/664_300x300.jpg" title="Quality 90, 3,857 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/664_300x300.jpg" title="Quality 95, 2,000 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/664_300x300.jpg" title="Quality 99, 741 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/664_300x300.jpg" title="Quality 100, 439 Bytes smaller">
<hr>
<img src="https://www.peterbe.com/guetzli/origin/690_300x300.jpg" title="Original, 30,473 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/690_300x300.jpg" title="Quality 85, 9,056 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/690_300x300.jpg" title="Quality 90, 4,962 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/690_300x300.jpg" title="Quality 95, 2,500 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/690_300x300.jpg" title="Quality 99, 881 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/690_300x300.jpg" title="Quality 100, 650 Bytes smaller">
<hr>
<img src="https://www.peterbe.com/guetzli/origin/693_300x300.jpg" title="Original, 20,107 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/693_300x300.jpg" title="Quality 85, 6,460 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/693_300x300.jpg" title="Quality 90, 4,095 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/693_300x300.jpg" title="Quality 95, 1,729 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/693_300x300.jpg" title="Quality 99, 594 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/693_300x300.jpg" title="Quality 100, 429 Bytes smaller">
<hr>
<img src="https://www.peterbe.com/guetzli/origin/746_300x300.jpg" title="Original, 23,203 Bytes">
<img src="https://www.peterbe.com/guetzli/guetzli85/746_300x300.jpg" title="Quality 85, 7,677 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli90/746_300x300.jpg" title="Quality 90, 5,047 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli95/746_300x300.jpg" title="Quality 95, 1,885 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli99/746_300x300.jpg" title="Quality 99, 753 Bytes smaller">
<img src="https://www.peterbe.com/guetzli/guetzli100/746_300x300.jpg" title="Quality 100, 547 Bytes smaller">
<hr>
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CSS 

              
                img {
    height: auto;
}
button {font-weight: bold; font-size: 150%}
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JS 

              
                function zoom(w) {
  [].slice.call(document.querySelectorAll('img')).map(img => {
    img.style.width = w;
  })
}
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999px

Console