Hi, I hope you don't mind, but I added a subpage on how to use this extension to embed a Pinterest feed, button, etc.Also added link on the extension page itself. If you don't want the extension known for these types of embeds please feel free to delete away.
Topic on Extension talk:NamespaceHTML/Flow
Appearance
Looks good. The only thing you might want to clarify is that the {{#tag:html|...
code goes in an allowed namespace and is transcluded to another page.
Thanks.
will do...