Inline KaTeX ($formula$) not rendering in Markdown editor

[raseyanen]

Inline KaTeX formulas using $formula$ syntax are displayed as plain text in the Markdown editor on Wiki.js 3.0.0-beta.663, despite the related issue having been closed as completed. The problem reproduces regardless of the math rendering setting chosen (KaTeX or MathJax) in the editor settings.

[dgesteves]

On 3.x, inline math goes in backticks inside the dollars, the same syntax GitHub and GitLab use:

The energy of a body at rest is $`E = mc^2`$, and the roots are $`\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}`$.

A bare $E = mc^2$ is never treated as math. That's deliberate, so $5 and $10 or $HOME in a sentence stay as text. It's spelled out in the hint under Administration > Editors > Markdown > Inline Math (the KaTeX/MathJax setting you switched). Your build has the feature: 3.0.0-beta.663 is commit ac0b3a3, the push right after inline math landed in ad59894 (plugin source).

Two related things:

• The KaTeX (or MathJax) block also has to be enabled under Administration > Content Blocks. If it isn't, the editor shows the formula as source, underlined in red, and warns that the block will be removed when the page is saved.
• Display math uses the block with a fence:

::block-katex
```latex
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
```
::

I ran the inline-math plugin from 3.0.0-beta.705 through markdown-it. $`E = mc^2`$ becomes <block-katex inline="true">E = mc^2</block-katex>, and $E = mc^2$ comes back as plain text.