My understanding is that in order for TW to parse an expression with katex, 
the expression needs to be inside $$ (or <$latex> widget). Otherwise the 
expression is treated as a wikitext/html.  That might explain why 
\begin{align} does not work - it's not inside $$ so TW does not know to 
parse this as a LaTeX command.

If you want align environment, you can use
$$
\begin{aligned}
   a&=b+c \\
   d+e&=f
\end{aligned}
$$
On Tuesday, July 20, 2021 at 9:58:58 PM UTC+7 Atronoush wrote:

> Testing in Tiddlywiki 5.1.23
>
> https://tiddlywiki.com/plugins/tiddlywiki/katex/
>
> Some example of KaTex:Supported Functions ยท KaTeX 
> <https://katex.org/docs/supported.html> 
>
> like
>
> \begin{align}
>    a&=b+c \\
>    d+e&=f
> \end{align} 
>
>
> return errors! Is there any setting I missed or Tiddlywiki does not 
> support these features?
>
> Mor example which do not work:
>
> $$
> \begin{equation}
> \begin{split}   a &=b+c\\
>       &=e+f
> \end{split}
> \end{equation} 
> $$
>
>
>
>
>

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