Inline Formatting

MaTiSSe extends standard Markdown with several inline text-formatting features commonly needed in scientific writing: strikethrough, superscript, subscript, footnotes, definition lists, sized images, and Quarto-compatible span classes.

Strikethrough

Wrap text with double tildes to produce <del> (rendered with a strikethrough line):

The ~~old result~~ corrected value is 42.

Renders as: The old result corrected value is 42.

Useful for showing edits, deprecated items, or crossed-out hypotheses.

Superscript

Wrap text with carets (^) to produce <sup>:

E = mc^2^

x^n^ + y^n^ = z^n^

The speed of light is 2.998 × 10^8^ m s^-1^.

Math vs. superscript

^ inside a $...$ or $$...$$ block is consumed by MathJax and never touched by the superscript processor. Use ^text^ for non-math contexts (units, ordinals, footnote-style markers) and $x^{n}$ for equations.

Subscript

Wrap text with single tildes (~) to produce <sub>:

Water is H~2~O.

Carbon dioxide CO~2~ is a greenhouse gas.

Sulfuric acid H~2~SO~4~.

Renders as: Water is H~2~O.

The single-tilde subscript is processed after the double-tilde strikethrough, so ~~del~~ is never mis-parsed as nested subscripts.

Footnotes

Use the standard Markdown footnote syntax:

The result was significant.[^1]

A second claim needs a source.[^source]

[^1]: p < 0.05, two-tailed t-test, n = 120.
[^source]: Smith et al. (2023), *Journal of Something*, 42(3), 1–12.

Footnote definitions can appear anywhere in the slide source; they are collected and rendered as a small block at the bottom of the slide content area.

Inline footnotes

The inline form ^[text] is a Pandoc/Quarto extension not supported by Python-Markdown. Use the reference form [^label] / [^label]: text instead.

Definition Lists

Use term\n: definition to produce <dl>/<dt>/<dd> blocks:

Accuracy
:   The closeness of a measured value to the true value.

Precision
:   The repeatability of a measurement under identical conditions.

Resolution
:   The smallest detectable change in a quantity.

Multiple definitions for a single term are supported:

Entropy
:   A measure of disorder in a thermodynamic system.
:   A measure of information content in a message (Shannon entropy).

Definition lists are well-suited for glossary slides, notation slides, and terminology overviews.

Image Attributes

Add {...} directly after a Markdown image to set HTML attributes:

![Circuit diagram](images/circuit.png){width="70%"}

![Result plot](images/results.png){width="400px" .figure}

![Logo](images/logo.png){#logo-img width="80px"}

Supported attribute forms:

Syntax	Effect
{width="60%"}	Sets width attribute on <img>
{height="200px"}	Sets height attribute on <img>
{.classname}	Adds a CSS class to <img>
{#my-id}	Sets the id attribute on <img>
{style="border:1px solid red"}	Inline CSS on <img>

Full-featured figures

For captions, complex layouts, and styling of the container, use the $figure environment instead. Image attributes are ideal for quick inline sizing without a caption.

Quarto-style Span Classes

Apply a CSS class (or arbitrary HTML attributes) to any inline run of text:

[Underlined text]{.underline}

[Highlighted passage]{.mark}

[CHAPTER TITLE]{.smallcaps}

[Custom styled word]{.my-class}

Built-in span classes

Three classes ship with the default stylesheet:

Class	Effect
.underline	text-decoration: underline
.mark	Yellow background highlight (background-color: #ff0)
.smallcaps	font-variant: small-caps

Custom classes

Any class name works — add the corresponding CSS rule to your theme or a custom stylesheet:

[emphasis]{.alert}

---
theme:
  layout:
    content:
      # no built-in hook; inject raw CSS via an overtheme or custom CSS file
---

Other attributes

Beyond class names, arbitrary HTML attributes are supported:

[anchor text]{#section-ref}

[tooltip text]{title="This is a tooltip"}

[styled inline]{style="color:crimson;font-weight:bold"}

Alternative legacy syntax

MaTiSSe's original custom-span syntax still works and is equivalent:

!!classname|text!!

The Quarto [text]{.class} form is preferred for compatibility with Quarto and Pandoc workflows.

Combining features

All inline features compose freely:

~~Old H~2~O formula~~ Revised: H~2~^18^O[^1] with [corrected]{.mark} yield.

[^1]: Isotopically labelled water; purity > 99.9 %.

Within $box, $note, $figure captions, and column content, all inline formatting is processed identically to slide body text.