I checked the link. The page describes customization of the HTML structure.
Who has specific knowledge of the way TinyMCE is used within Publii? The API I am trying to access concerns where a Post is created and processed by TinyMCE before publication. The custom node filter, a standard TinyMCE API call, will act on HTML/XML as it is processed.
I would be very grateful if someone can provide a description of how TinyMCE processes the input HTML within Publii sufficient for me to grep the right files.