Typora is really nice, I use it as well. On my Android tablet (together with a physical keyboard) I use Epsilon Notes, that also works nicely, even if it doesn't have WYSIWYG editing mode. It does have a nice reading mide, though, which makes it excellent for referencing.
As an update: I'd found a paper I'd been hunting for for a few years, in a really poor-quality online version. Typed out 102 pages (typewritten equivalent, double-spaced), in Markdown, with 180 footnotes. End result is a very high-quality HTML, PDF, ePub, and other available-formats document.
I :heart: Markdown.
The two elements of the original I couldn't support were one right-aligned line, and a small-caps formatted word (both in an embedded quoted letter).