Typing in Drafts, then viewing streaming preview, this shows at top:
source: Drafts.app
Help doc "Declaring the Source Application" says apps can declare as source usually using a comment as in:
<!--
source: Drafts.app
-->
However, in preview source, this is what shows:
<p>
source: Drafts.app
</p>
Where does the problem lie, in Marked or in Drafts?