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Pen Settings

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

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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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Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation


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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

              <main class="markdown-body">
  <script type="text/markdown">

    Stylish Markdown

    I love Markdown... I mean, who doesn't?  I use it for everything: wiki pages, release notes, API documentation, deployment guides, to do lists for my wife.  Ok maybe not that last one, I'm usually *the recipient* of the to do lists!

    When distributing documentation as part of a release, we tend to convert the Markdown into HTML with hyperlinks, logos, fonts and colour schemes; then use [wkhtmltopdf](https://wkhtmltopdf.org/) to convert it into a PDF.

    Recently I've been trialing a different approach - wrapping the Markdown inside a thin layer of HTML, then converting it into HTML on the fly using JavaScript.  The advantage is that the document remains *diff-able*, so the recipient can compare the current document with a previous version by using standard text-based differencing tools on the HTML source code (which is mainly Markdown).

    This approach is really useful for things like API specifications, were every small change needs to be carefully scrutinised. With PDF documents you usually only have a few short entries in a version table (if you're lucky).

              var converter = new showdown.Converter();
var elements = document.querySelectorAll("script[type='text/markdown']");

elements.forEach(function (element) {
  var markdown = unindent(element.innerHTML);
  var html = converter.makeHtml(markdown);

  var div = document.createElement('div');
  div.innerHTML = html;

function unindent(value) {
  var indent = value.match(/^( +)\S/m);
  if (indent) { 
    value = value.replace(new RegExp('^' + indent[1], 'gm'), '');
  return value.trim();
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