Hailstorm

WCAG 1.0 Guideline 4: Clarify natural language usage. Content developers should provide expansions of abbreviations and acronyms.

Accessibility Abbreviation

Add abbreviation-tags via TinyMCE to comply with the Web Content Accessibility Guidelines.

Nazmi Aydogdu

Lightweight content optimizer, use for a better #a11y !
Automatically add hints/explanations for abbreviations or acronyms to all of your content.
You can use this plugin if you want to improve the accessibility of your content, especially if you often use acronyms or abbreviations.
Note : 
* For a given word, tag will only be added at first occurrence.
Coming soon : 
* lang attribute support

ABBR Hint Content

Automatically add hints/explanations for abbreviations or acronyms to all of your content.

Accessibility Abbreviation vs ABBR Hint Content