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`.
{{<codeBlock>}}
{{% codePen VpVNKW %}}
{{</codeBlock>}}
This will embed the identified codePen into the content wherever you placed the shortcode, with the result view showing by default:
{{% codePen VpVNKW %}}
{{% warning %}}
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.
{{% /warning %}}
**Infusion** also supports the ability to write inline demos directly in markdown files. See {{% pattern "Writing inline demos" %}}.
