Joris van Montfort

<p>Adds a simple collapsible block to the Gutenberg editor. Perfect for hiding long text behind a toggle.</p>
<ul>
<li>Fully compatible with the block editor (Gutenberg)</li>
<li>Customizable button labels</li>
<li>Supports multiple blocks per page</li>
<li>Translatable and lightweight</li>
</ul>
<p>This plugin is ideal for bloggers, content creators, and developers who want to keep their pages clean and readable.</p>


JVM Read More Block

A lightweight Gutenberg block that lets you toggle extra content with "Read more" and "Read less" buttons. No CSS markup is added.

Ady Romantika

<p>This simple plugin is a widget that displays a collapsible archives list in your widgetized sidebar by using JavaScripts. In version 2.0.0 script.aculo.us effects has been added as an option, utilizing the script.aculo.us files supplied with WordPress.</p>
<h3>Configuration</h3>
<ul>
<li>Widget title: the title of the widget</li>
<li>Show post counts for year: Whether or not to show the post number for each year</li>
<li>Show post counts for month: Whether or not to show the post number for each month</li>
<li>Abbreviate month names: Check this box to show abbreviation of month names</li>
<li>Hide year from month names: Do not print year after month names</li>
<li>Use script.aculo.us effects: Whether or not to show effects</li>
<li>Expand effect: Effect to use when expanding the list</li>
<li>Collapse effect: Effect to use when collapsing the list</li>
<li>Expand the list by default: Check this box to have the list expanded when loaded</li>
<li>Expand current year by default: Check this box to have the current year expanded when loaded</li>
<li>Expand current month by default: Check this box to have the current month expanded when loaded</li>
<li>Show individual posts: Show posts in the list. This should be used in extra caution; if you have a lot of posts consider disabling it as this will take time to load</li>
<li>Use HTML arrows instead of images (► ▼) </li>
<li>Show current month in bold: show current month in bold </li>
<li>Show a link to plugin page. Thank you for your support! : Display a link to plugin page as a support method</li>
</ul>
<h3>TODO</h3>
<ul>
<li>Add ability for multiple instances</li>
<li>Add ability to work as non-widget</li>
<li>Add ability to include / exclude categories</li>
<li>Expand previous month rather the current</li>
<li>Research the practicality to use CSS / allow CSS options</li>
<li>List posts without year and month headers (for blogs with few posts)</li>
<li>Do not list the posts that are listed on the main page</li>
</ul>


Collapsible Archive Widget

This simple plugin is a widget that displays a collapsible archives list in your widgetized sidebar by utilizing JavaScript.

JVM Read More Block vs Collapsible Archive Widget