Md Abul Bashar

<p>Accord Blocks provides easy-to-use Gutenberg blocks for creating beautiful accordions and FAQs. Built with modern web technologies and optimized for performance, this plugin helps you create engaging and interactive content sections.</p>
<h4>Key Features</h4>
<ul>
<li>
<p><strong>Two Powerful Blocks:</strong></p>
<ul>
<li>FAQ Block: Create individual FAQ items with questions and answers</li>
<li>FAQ Group Block: Group multiple FAQs together with shared settings</li>
</ul>
</li>
<li>
<p><strong>Rich Customization Options:</strong></p>
<ul>
<li>Customizable colors and backgrounds</li>
<li>Typography controls for titles and content</li>
<li>Adjustable spacing and borders</li>
<li>Responsive design for all screen sizes</li>
</ul>
</li>
<li>
<p><strong>Smart Functionality:</strong></p>
<ul>
<li>Accordion mode (optional)</li>
<li>Open/close animation effects</li>
<li>Option to set items open by default</li>
<li>SEO-friendly structure</li>
</ul>
</li>
<li>
<p><strong>Advanced Features:</strong></p>
<ul>
<li>Schema markup for better SEO</li>
<li>Rich text support in questions and answers</li>
<li>Smooth animations for better user experience</li>
<li>Group title customization options</li>
</ul>
</li>
</ul>
<h4>Use Cases</h4>
<ul>
<li>Product FAQs</li>
<li>Knowledge Base sections</li>
<li>Service descriptions</li>
<li>Course curricula</li>
<li>Support documentation</li>
<li>General accordions</li>
</ul>


Accord Blocks – The Easiest Accordion & FAQ Blocks

Create beautiful and SEO-friendly accordions and FAQs with Gutenberg blocks. Build engaging content sections and knowledge bases easily.

Miguel Useche

<p>This plugin provides a widget and a filter to display a collapsible list of categories in your sidebar or posts by using vanilla Javascript.</p>
<h4>Features</h4>
<ol>
<li>Support for Gutenberg blocks. Add it to any FSE theme or Gutenberg compatible theme.</li>
<li>Display a collapsed list of your archives to reduce space.</li>
<li>Uses vanilla JS to add effects and to be compatible with all browsers.</li>
<li>Select the symbol for expanding/collapsing categories</li>
<li>Select categories to exclude, so it shows only the categories you want.</li>
<li>Autoexpand selected category (including it parent or child).</li>
<li>Support for multiple instances.</li>
<li>Simple layout configuration</li>
<li>Shortcode support  <em>[JsCategoriesList]</em></li>
<li>Translated to Spanish, Italian Russian, Slovak, Czech.</li>
<li>Compatible with most JS cache and minify plugins.</li>
<li>And more to come…</li>
</ol>
<h3>Configuration</h3>
<ul>
<li>Title: title of the widget.</li>
<li>Trigger Symbol:  characters to be displayed as a bullet.</li>
<li>Symbol position: where to put the expand/collapse symbol.</li>
<li>Effect: JS’s effect to use.</li>
<li>Order by: display order of categories.</li>
<li>Expand: if list should be expanded or callapsed by default.</li>
<li>Show number of posts: display how many post are published in the category.</li>
<li>Show empty categories: display categories with no posts.</li>
<li>Categories to include: categories to be included from the list.</li>
<li>Categories to exclude: categories to be excluded from the list.</li>
</ul>


JS Categories List Widget

Haven't seen any problems running this with WordPress 4.9.8, even though it's marked as untested for a long time.  It must have been well written.

Works well with 4.9.8

A simple Gutenberg block and JS widget (can be called from posts) for displaying categories in a list with some effects.

Accord Blocks – The Easiest Accordion & FAQ Blocks vs JS Categories List Widget