I want to use reveal.js with markdown. I followed the full set up installation guide
- install node.js
- Clone the reveal.js repository
- Move to the reveal.js folder and install dependencies
- run
npm startinside reveal.js folder
and then I have modified the index.html page to add markdown following the documentation
<section data-markdown>
<textarea data-template>
## slide 1
please add me another slide
---
## slide 2
I _need_ it
---
## slide 3
</textarea>
</section>
However the markdown is not fully working :

Everything is on the same slide and the 2nd line should be a paragrapher. what should I do ?
reveal.js@4.0.2