Why ? That would be fantastic !

We've re-opened this issue. Certainly it is worth implementing, and it is mentioned from other issues (#150, #235).

We are planning to support mermaid.js in the core of Marp Next.

```mermaid
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
```​

I would like to contribute to this issue. Is there a recent thread about the development of this particular feature?

This issue is targeted to Marp Next, so you should implement it on marp-team/marp-core if you want to start working.

yhatt/marp is already not maintained, so any pull requests for this repo would not merge.

There is not a thread for this development because marp-core is not ready to accept contributing by lacking of the contributing guideline (only a team guideline is applied). However I think mermaid.js could support by changing the implementation of Marp.highlighter().

I had tried to implement better support of Mermaid to Marp Core, but I have stopped work because it has several problems. We wait until the improvement of mermaid to support the non-browser environment.

I'll write down the working memos...

• The easiest way to use mermaid is using markdown-it-mermaid plugin. But it is not working without web context. Marp Web is converting Markdown within Web Worker for performance, so it does not work.

• Execute mermaid.initialize() in Marp.ready() is also working with conversion <div class="mermaid"> in highlighter(). However, it has blinking chart in Marp Web's live preview.

• Marp for VS Code is supporting Markdown Preview mermaid support experimentally. Sadly the example graph has the incorrect text size.

---
marp: true
---

```mermaid
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
```​

need support of mermaid...

@mymmoonoa You can try to use mermaid.js directly via HTML as a workaround, only for Marp Next tools with enabled HTML.

# Mermaid

<div class="mermaid">
graph TD;
    A-->B;
    A-->C;
    B-->D;
    C-->D;
</div>

<!-- mermaid.js -->
<script src="https://unpkg.com/mermaid@8.1.0/dist/mermaid.min.js"></script>
<script>mermaid.initialize({startOnLoad:true});</script>

# Marp CLI
marp --html mermaid.md