Add discussion of collapsible/expandable text to markdown article

The markdown article at The Ultimate Guide to Writing & Publishing with Markdown is fantastic, but even in the advanced section it fails to discuss collapsible/expandable text. This seems to be currently possible in markdown (e.g. the below text seems to work for me when I try it). Please consider adding this to the advanced section of that article, and any related abilities too!

<details>
  <summary>Your header here! (Click to expand)</summary>
  Your content here...</br>
  (markup only where supported)</br>
  more content here...</br>
</details>

Thank you so much for sharing this!

I can’t get this to work in Ghost, what do you do? [nevermind i didnt realize there is a markdown content adder!]

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