Interactive view hide / expand collapse control in HTML without JavaScript

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This post describes how to create an interactive view/hide or expand/collapse control in HTML without JavaScript.

The HTML to create this control is as follows:

<details>
    <summary>Show details...</summary>
    <p>Here are the details!</p>
</details>

By default, this will start collapsed / hidden:

Details...

Here are the details!


You can add the "open" attribute to start the control in a visible / expanded state: 

<details open>
    <summary>Show details...</summary>
    <p>Here are the details!</p>
</details>
Details...

Here are the details!


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