HyperDown
    footnote
      ✓ 脚注
    heading type1
      ✓ #heading#
      ✓ ######heading######
    heading type2
      ✓ heading ======
    bold
      ✓ **bold**
    italy
      ✓ *italy*
    list
      ✓ ul
      ✓ ol
    bugfix
      ✓ escape
      ✓ table

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