Apparently it is impossible to effectively use markdown while in the WYSI(n't)WYG editor unless each is typed followed by a newline which starts a new paragraph, except for changing style and weight.

Heading 1

Heading 2

Heading 3

Heading 4

Heading 5

Heading 6

Bold

Italic

block quote

1. ordered list

• unordered list

`code`

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Markdown Cheat Sheet

| Table | Table |

code
block

Footnote[^1]

[^1]: This is the footnote

Term
: Definition of the term

~strikethrough~

• [x] task list item
• [ ] task list item

:smile:

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H~2~O

πr^2^

Thank you, @1P_SimonH.

If a fuller support of Markdown is challenging, then the one most significant missing item is `code` for a fixed-width typeface. This should be the simplest to implement.

This is made more challenging by the editor offering "Preformatted" in the drop-down for new posts (and only for paragraph style), but offering only a minimal subset of the formatting toolbar for replies where Markdown and shortcuts offer different subsets of features.

`code`

Rule
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| Table | Table |

Footnote[^1]

[^1]: This is the footnote

Term
: Definition of the term

- [x] task list item
- [ ] task list item

:smile: emoji

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H~2~O subscipt

πr^2^ superscipt