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. You can use the CSS from another Pen by using it's URL and the proper URL extention.

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JavaScript

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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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.

Behavior

Save Automatically?

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Auto-Updating Preview

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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

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Visit your global Editor Settings.

HTML

              
                <!DOCTYPE html>
<html>
<body>

<p>
このように改行やスペースをいれても反映されることはありません。
contains a lot of lines
in the source code,
but the browser 
ignores it.
</p>

<p>
This paragraph
contains      a lot of spaces
in the source     code,
but the    browser 
ignores it.
</p>

<p>
The number of lines in a paragraph depends on the size of the browser window. If you resize the browser window, the number of lines in this paragraph will change.
</p>

</body>
</html>
              
            
!

CSS

              
                
              
            
!

JS

              
                
              
            
!
999px

Console