Chris

This WordPress plugin will allow users to maintain a list of acronyms and abbreviations which can be managed in the WordPress Dashbard. These acronyms will be automatically wrapped in the appropriate HTML markup when found in posts, pages and comments.
The plugin will auto-detect whether the currently active theme uses HTML5, and will output the appropriate HTML acronym or abbreviation element, e.g. <code><acronym title="Hypertext Markup Language">HTML</acronym></code> (or <code><abbr title="Hypertext Markup Language">HTML</abbr></code> for HTML5).
Based on Joel Pan’s excellent Acronyms, which is no longer being actively maintained. The onset of HTML5 and the deprecation of <code><acronym></code> in favour of <code><abbr></code> led me to fork Joel’s plugin and create Acronyms 2.

Acronyms 2

A plugin to automatically mark up known acronyms and abbreviations in posts and comments. Allows users to manage lists of acronyms through the WordPre …

Whodunit

Jb Audras

Guillaume TURPIN

The goal of this plugin is to provide expansions or definitions for abbreviations by using the <code>abbr</code> HTML element. It helps to make your website compliant to the <a href="https://www.w3.org/WAI/WCAG21/Understanding/abbreviations.html" rel="nofollow ugc">success criterion 3.1.4 of Web Content Accessibility Guidelines (WCAG)</a>.
It is always appropriate to use the <code>abbr</code> element for any abbreviation, including acronyms and initialisms. This HTML element helps to make sure the abbreviation is understood by assistive technologies, by informing the user agent that the characters are an abbreviation, and by providing its meaning using the <code>title</code> attribute.
This plugin adds a new <code>abr</code> format button in the formatting toolbar of the block editor.

Abbreviation Button for the Block Editor

Add an abbreviation format button to the formatting toolbar in the block editor.

Acronyms 2 vs Abbreviation Button for the Block Editor