Probably everyone know how to do this.

I had a long first section in my markdown that I could fold in my editor but found myself scrolling in the html and thought wouldn't it be handy if that was folded to.

I had a google and found the github page with instructions on how to do it, wrapping in a details tag:

# A collapsible section with markdown
<details>
  <summary>Click to expand!</summary>
  
  ## Heading
  1. A numbered
  2. list
     * With some
     * Sub bullets
</details>

I added it, did a Pandoc conversion and very unexpectedly it worked perfectly!!! Fantastic :-)

Googling "collapsible section Pandoc markdown" did not find any Pandoc help but then looking at the HTML source I leaned about the HTML details tag and it was not markdown at all.

Everyday is a schoolday!"