One of the underused HTML elements is the <details> element. For the uses cases this tag gives you, it is not used enough on websites.

Lets explore its uses together. This tag is used to make an expanding/collapsing detail/summary view. The browser then adds interaction to the element, allowing the user to open/close the element itself. Lets take a look at a basic example:

<details>
    <summary>This is the summary</summary>
    <p>This is the body</p>
    <p>Multiple tags are allowed here</p>
</details>