Editing code card


I setup the default sample site then exported the content.
The Welcome page which introduces the visual editor has a code card containing:

        "code": "<header class=\"site-header outer\">\n    <div class=\"inner\">\n        {{> \"site-nav\"}}\n    </div>\n</header>"

I don’t understand how the editor creates or updates this content. Is this a hidden feature?
I need the identical thing for my content, but can’t figure out if it’s possible.


Arg never mind. Figured it out.