LaTeX 
Slidev comes with LaTeX support out-of-box, powered by KaTeX.
Inline 
Surround your LaTeX with a single $ on each side for inline rendering.
md
$\sqrt{3x-1}+(1+x)^2$Block 
Use two ($$) for block rendering. This mode uses bigger symbols and centers the result.
latex
$$
\begin{aligned}
\nabla \cdot \vec{E} &= \frac{\rho}{\varepsilon_0} \\
\nabla \cdot \vec{B} &= 0 \\
\nabla \times \vec{E} &= -\frac{\partial\vec{B}}{\partial t} \\
\nabla \times \vec{B} &= \mu_0\vec{J} + \mu_0\varepsilon_0\frac{\partial\vec{E}}{\partial t}
\end{aligned}
$$Line Highlighting 
To highlight specific lines, simply add line numbers within bracket {}. Line numbers start counting from 1 by default.
latex
$$ {1|3|all}
\begin{aligned}
\nabla \cdot \vec{E} &= \frac{\rho}{\varepsilon_0} \\
\nabla \cdot \vec{B} &= 0 \\
\nabla \times \vec{E} &= -\frac{\partial\vec{B}}{\partial t} \\
\nabla \times \vec{B} &= \mu_0\vec{J} + \mu_0\varepsilon_0\frac{\partial\vec{E}}{\partial t}
\end{aligned}
$$The at and finally options of code blocks are also available for LaTeX blocks.
Chemical equations 
To enable the rendering of chemical equations, the mhchem KaTeX extension needs to be loaded.
Create vite.config.ts with the following content:
ts
import 'katex/contrib/mhchem'
export default {}Now chemical equations can be rendered properly.
latex
$$
\displaystyle{\ce{B(OH)3 + H2O <--> B(OH)4^- + H+}}
$$Learn more: Syntax