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# CodePen embedding

Sometimes just pictures of the pattern you’re documenting aren’t enough. Interactive patterns benefit from live demos, so that readers can test their functionality.

Infusion offers a couple of ways to do this. The first is by embedding CodePen demos into the content. The `codePen` shortcode takes just one argument: the codePen’s `ID`.

    {{% codePen VpVNKW %}}

This will embed the identified codePen into the content wherever you placed the shortcode, with the result view showing by default:

The compiled site will output an error if your `config.toml` does not include your CodePen username (in the `codePenUser` parameter). This is needed to construct the embed URL.

Infusion also supports the ability to write inline demos directly in markdown files. See
Writing inline demos.