# Embed Code demos in Markdown
You can embed demos in MarfeelDocs with codepen (opens new window) or codesandbox (opens new window).
# Codesandbox
Create a codeblock, name it codesandbox
, and paste the URL!
```codesandbox
https://codesandbox.io/s/new
```
Expected result:
MarfeelDocs transforms the Sandbox URL into its embed-friendly version for you.
# Codepen
Create a codeblock, name it codepen
, and paste the URL!
```codepen
https://codepen.io/Mamboleoo/pen/XWJPxpZ
```
Expected result:
See the Pen by @Mamboleoo on CodePen.