In my previous post, I wrote about how handy collapsing and expanding sections can be. Although there are several plugins that enable this functionality, it's pretty easy to create this functionality yourself from scratch.
Feel free to use this script or fork it into something better. I added a comment above each line to indicate what's going on. I know there are a lot of similar scripts out there, but many of them are overly complicated. Others don't have the visual expanding or collapsing icons. As far as I can tell, this script is as simple as it can be (just remove the commented lines to shorten it), and it functions the same.
I know there was some discussion about the effectiveness of collapsing sections. In some instances, there are pretty persuasive use cases. For example, if you have an API with various methods that you can run on an object, and you want to list all methods on the same page, collapsing sections will make it easy for users to scan and find the method they're looking for.
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