Pen Settings



CSS Base

Vendor Prefixing

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.

+ add another resource


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.

+ add another resource


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.


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.


                This guide shows you how to use Markdown instead of HTML when
writing posts or comments.

Markdown is way easier to use than HTML.  (But you can still use HTML at the
same time if you really want to and you know how.)

Just write in the comment box *the same way it's shown in this file*, it's
really that simple.

For more info about Markdown itself click [Markdown]( "Markdown web site")


To use text for the link, write it [like this](http://someurl).

You can add a *title* (which shows up under the cursor) [like this](http://someurl "this title shows up when you hover").

Reference Links

You can also put the [link URL][1] below the current paragraph like [this][2].

   [1]: http://url
   [2]: http://another.url "A funky title"

Here the text "link URL" gets linked to "http://url", and the lines showing 
"[1]: http://url" won't show anything.

Or you can use a [shortcut][] reference, which links the text "shortcut" 
to the link named "[shortcut]" on the next paragraph.

   [shortcut]: http://goes/with/the/link/name/text


Use * or _ to emphasize things:

*this is in italic*  and _so is this_

**this is in bold**  and __so is this__

***this is bold and italic***  and ___so is this___

Just write paragraphs like in a text file and they will display how you would expect.  A blank line separates paragraphs.

So this is a new paragraph. But any text on adjacent lines will all end up in the same paragraph.


> Use the > character in front of a line, *just like in email*.
> Use it if you're quoting a person, a song or whatever.
> You can use *italic* or lists inside them also.
And just like with other paragraphs,
all of these lines are still
part of the blockquote, even without the > character in front.  

To end the blockquote, just put a blank line before the following paragraph.

Preformatted Text

If you want some text to show up exactly as you write it, without Markdown
doing anything to it, just indent every line by at least 4 spaces (or 1 tab).

    This line won't *have any markdown* formatting applied.
    I can even write <b>HTML</b> and it will show up as text.
    This is great for showing program source code, or HTML or even Markdown.
    <b>this won't show up as HTML</b> but exactly <i>as you see it in
    this text file</i>.

(In a normal paragraph, <b>this will show up in bold</b> just like normal HTML.)
   Remember, you have to indent by *at least 4 spaces* to do it.  This paragraph won't be preformatted.
And if you use [reference][] links, make sure the links are indented 
by *fewer than* 4 spaces.

(woops, that link didn't work, see? It just got displayed as preformatted text.)  

As a shortcut you can use backquotes to do the same thing while inside
a normal pargraph.  `This won't be *italic* or **bold** at all.`


* an asterisk starts an unordered list
* and this is another item in the list
+ or you can also use the + character
- or the - character

To start an ordered list, write this:

1. this starts a list *with* numbers
+  this will show as number "2"
*  this will show as number "3"
9. any number, +, -, or * will keep the list going.
    * just indent by 4 spaces (or tab) to make a sub-list
        1. keep indenting for more sub lists
    * here i'm back to the second level


This is a huge header

this is a smaller header

Just put 1 or more dashes or equals signs (--- or ===) below the title.

You might use the huge header at the very top of your text for a title or
something (except weblog posts usually already have a title), and use the
smaller header for subtitles or sections.

Horizontal Rule

just put three or more *'s or -'s on a line:


or you can use single spaces between then, like this:

* * *


- - - - - - - 

Make sure you have a blank line above the dashes, though, or else:

you will get a header


To include an image, just put a "!" in front of a text link:

![alternate text](

The "alternate text" will show up if the browser can't load the image.

You can also use a title if you want, like this:

![tiny arrow]( "tiny arrow")


What if you want to just show asterisks, not italics?

* this shows up in italics: *a happy day*
* this shows the asterisks: \*a happy day\*

The backslashes will disappear and leave the asterisks.

You can do the same with any of the characters that have a special meaning
for Markdown.

More Headers

More ways of doing headers:

# this is a huge header #
## this is a smaller header ##
### this is even smaller ###
#### more small ####
##### even smaller #####
###### smallest still: `<h6>` header

You can use up to 6 `#` characters at the beginning of the line.  
(You can optionally put them on the end, too, and they will disappear.)

HTML crap

Don't worry about special HTML characters. I can write an ampersand & a 
less-than sign, and they show up as I intend them to:  3 < 4.

(You can still write `&amp;` (& character) and `&lt;` (<) or `&gt;` (>) if you want.  or ignore what I just said.)


Thanks to John Gruber and Aaron Swartz for creating Markdown.

Thanks to Greg Schueler for writing this text.