lastsplash (a11n)

Beginning with WordPress v6.3, a Details Block is included in WordPress. This plugin is no longer needed.
The block allows you to easily show and hide content using built-in browser functionality. It doesn’t load any external JavaScript and relies on native HTML functionality. You can configure the appearance using built-in editor controls.
It uses the HTML <code>details</code> element to show and hide the content.

Details: Show and Hide

Denis Žoljom

The plugin will provide a collapsible HTML <code><details></code> block with a <code><summary></code> element that will be shown when the element is collapsed. Inside the details you can put as many paragraphs or code blocks as you want.
<h4>Requirements</h4>
<ul>
<li>PHP 5.6 or greater (recommended: PHP 7 or greater)</li>
<li>WordPress 5.0 or above (because of the Gutenberg editor)</li>
</ul>

Details Summary Block

This plugin provides a simple block for the `` HTML element.

Details: Show and Hide vs Details Summary Block