MMD "Viariants"

Editorial

Bug:

Within Code delimiter (```), <> are not escaped. i.e. HTML codes within code block will still be HTML codes, not plain text.

Does not support:

MMD metadata block (e.g. title is ignored)
superscript & subscript (e.g. if MultiMarkdown is not selected, there's an option to select superscript. But once MMD is enabled, MMD styled superscript and subscript is not supported)
Abbreviations
Inline footnote
``this kind of smart quote'' will not resulted in “this”
Code class (e.g. "```tex" should becomes <code class="tex">...)
Math class (it doesn't have <span class="math">... enclosing the math)

HTML rendered by Drafts 4 (using the default markdown engine claimed to be MultiMarkdown) comparing to MultiMarkdown's reference rendering:

in the newest MMD, metadata related to LaTeX are suppressed
auto Cross-References does not work: [heading][] syntax is not supported.
all the headings do not have auto-id: # heading1 should have an id of heading1
CriticMarkup is not supported
the rendering of the tables has some differences in the code, probably because of an older version of MMD?
if I put {{TOC}} (one in the markdown source), Drafts would incorrectly rendered it asTOC`
Drafts put <br/> into Math environments, which I believe is a mistake.