Markdown to create a collapsible table of contents

Question

I'm new to markdown and I'm writing a README.md file in Github. I know how to create a table of contents with markdown and also a separate collapsible section.

Is there a way to create a collapsible table of contents with markdown? (A table of contents, which can be collapsed by the user's click.)

## Table of Contents
-   [Regex](#regex)


<details>
  <summary>Table of Contents</summary>
  -   I want to add a link to the *Regex* section in my markdown.
</details>



### Regex
The details will be here...

Answer 1

From what I see, it looks like you want the 'Table of Contents' to be a heading. While I don't know how to do make a heading collapsible, you can work around that by styling your summary to look like a heading this way:

<style>

    #tableOfContents {
        font-size: 1.5em;
    }

</style>

<p>
<details>
<summary id="tableOfContents">Table of Contents</summary>

- [Regex](#regex)

</details>
</p>

### Regex
The details will be here..