backwards compatible with what? In my experience anything served as `text/*` that isn’t more specifically handled (eg `text/html`) will be rendered as text/plain because the type is still `text`.

Edit: rendered, not tendered

Thanks for the link. I get that this would help with emails, but pushing markdown into text/plain wouldn't be helpful for web content on browsers.

The web already has Content Negotiation to let older clients prefer html or plain text content.