This is one so you can make the Summary description a lot more editable in Hide Details. 
So, instead of using 
Hide Details, which will give you something like this to start with:
[details="Summary A"]
This text will be hidden
[/details]
Summary A
This text will be hidden
You can type this in instead:
<details>
<summary>
Summary B
</summary>
This text will be hidden
</details>
Summary B
This text will be hidden
So far these will give exactly the same result on publish. However, the second example is a lot more amendable. So you could make the Summary header bold or italic, or add an embedded link.
You’d have to use a slightly different format within the <details>block, but if you stick with the <b></b>, <i></i>sort of tags you should be fine.
So, for example, this:
<details>
<summary>
Lovehoney Forum <a
Href="https://lovehoneyforum.com/t/certified-and-licensed-badges-discobot-tutorials/257800"><b>Tutorials</b></a>
</summary>
Many people have been wondering how to get their Certified and Licensed Badges, and it turns out we should all have had a personal message from Discobot when we signed up (I did not get one. I’m trying not taking it personally, but it’s tough). *[Read more... ](https://lovehoneyforum.com/t/certified-and-licensed-badges-discobot-tutorials/257800)*
</details>
Would become this:
Lovehoney Forum Tutorials
Many people have been wondering how to get their Certified and Licensed Badges, and it turns out we should all have had a personal message from Discobot when we signed up (I did not get one. I’m trying not taking it personally, but it’s tough). Read more…
I think the biggest jump in skill compared to the easier way is the embedded link, but here it is in full so you can see where I’ve put the format tags.
<a Href="https://lovehoneyforum.com/t/certified-and-licensed-badges-discobot-tutorials/257800"><b>Tutorials</b></a>
So, there you go. 
Useless to most, but I’m sure there will be someone planning an ambitious info guide, and this might be just the ticket.