Insert Annotations

This page collects the ways to say a little more without breaking the sentence.

Superscript and Subscript

Effect	Syntax
Superscript	^text^ or <sup>text</sup>
Subscript	~text~ or <sub>text</sub>

Water is H~2~O, and area is measured in m^2^.

The toolbar has a button for each. For a whole equation rather than a stray symbol or two, math is the better tool.

Subscript shares the tilde with strikethrough

One ~ is a subscript; two ~~ is strikethrough. To write a literal tilde, escape it: \~.

Footnotes

A reference in the body, a definition on its own line, and the two identifiers must match:

The conclusion holds under one condition[^1].

[^1]: Only for samples larger than 500.

The identifier can be a number or a word ([^condition]) as long as it has no spaces. The toolbar's footnote button inserts both halves and picks an identifier that is not already in use.

Footnotes suit the supporting material — a source, a caveat, an aside — too important to delete but disruptive in the sentence itself.

Highlight

This part ==matters==, and <mark>this</mark> is the same thing.

Shortcut: ⌘⇧H. The two spellings are equivalent and render as the same vivid yellow in all three themes.

Abbreviations

Define one once and every occurrence carries its expansion:

*[PKM]: Personal Knowledge Management

Keys and Small Text

Effect	Syntax	For
Key	<kbd>⌘K</kbd>	Naming a keystroke in a set of steps
Small	<small>text</small>	An aside that should not compete
Underline	<u>text</u>	Emphasis where bold and italic are wrong

Emoji

Type a shortcode such as :smile: — no need to switch input methods.

Next Steps

• Insert Math — Full mathematical typesetting
• Tags — Better than an inline marker for classifying across notes