Rendering LaTeX in mermaid flowchart

[ellafm]

Description

---
title: "Some title"
format: html
---

```{mermaid}
flowchart LR
  A[$$x^2$$] --> B(Round edge)
  B --> C{Decision}
  C --> D[Result one]
  C --> E[Result two]
```

Results in:

The latex is not rendered, but this issue is not present when the flowchart is rendered in mermaid live editor, as shown

I'm using quarto version 1.5.56, using VS Code on Windows 10

[ellafm]

I think I figured this out. According to the release notes, quarto has been upgraded to natively work with mermaid 10.2.0, but this version does not seem to support latex in flow diagrams. I have managed to get this working as intended by including the following script:

        include-in-header:
            text: |
                <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/mermaid.min.js"></script>

[mcanouil]

And for everyone that will try "LaTeX" things, as documented, Mermaid.js is using KaTeX, so you also need to understand what KaTeX supports before reporting issues/bugs (https://katex.org/).

[ellafm]

Incidentally, I think there may also be a bug in mermaid 11.2.1 with how it interprets escape characters. See:
https://github.com/orgs/mermaid-js/discussions/5885

[felixvuo]

I'm also struggling to get LaTeX rendered from quarto+mermaid - I am using the pdf output. Here's my source:
---
title: "Important Concepts"
format:
pdf:
documentclass: scrartcl
---

# An Example

```{mermaid}
%%| label: fig-tree
%%| fig-cap: An important graph
graph TD
    A("$$x+y+z \leq 5$$")
    A -- "$$x=1$$" --> A1
    A -- "$$x=2$$" --> A2
    A -- "$$x=3$$" --> A3
```

In @fig-tree we can see a beautiful thing.

I am using quarto 1.5.57, the latest .deb I found for Ubuntu. The rendered output looks like this:

I have tried with or without the double quotes, same output. Any further suggestions? E.g. can I point quarto to the latest mermaid version somehow?

[cderv]

@felixvuo from answers just above I think you need pre-release 1.6.12 to get latest mermaid.js

Please do try it: quarto.org/docs/download/prerelease.html

[felixvuo]

@cderv thank you, it does seem to work fine with 1.6.12.