This allows you to hide "spoiler text", form questions, or add material to the page that does not take up too much space. Here is the code:

<summary style="background-color: whitesmoke; font-weight: bold; cursor: pointer;">
What is the innervation of biceps brachii? <small>(click to reveal)</small></summary>

<div id="reveal" class="pad-box-mini border-round" style="border: thin solid grey;">
<p>Musculocutaneous nerve</p>
</div>

</details>

This is what it looks like:

What is the innervation of biceps brachii? (click to reveal)

Musculocutaneous nerve

You can also add imaged, embedded videos/3d models to this as well (just paste the embed code in place of the text in HTML Editor)

Click here to refresh this concept (click to reveal)

paste in the html, then save and view in Rich Text Editor. Then it is easy to import an image into this box.

sample image panda.jpg

Click here to refresh this concept (click to reveal)

Click here to refresh this concept (click to reveal)

Hairy Woodpecker by RISD Nature Lab on Sketchfab