gfm.autolink
– Turn URLs into linksgfm.automail
– Turn email addresses into linksgfm.hidden_hilite
– Fenced code blocks with no highlightinggfm.semi_sane_lists
– GitHub-like list parsinggfm.spaced_link
– Links with optional whitespacegfm.strikethrough
– Strike-through supportgfm.tasklist
– Task list support