MrXHellboy

Danila Vershinin

Wrap abbreviations for search engine optimization and support other applications
Using abbreviations on your website is not a bad idea since people will get tired of reading the same over and over again. 
Unfortunately, search engines and other application which might render your website are not that great with abbreviations. 
Reading software, spelling checkers, language translations or other applications might fall over them.
By wrapping abbreviations in the therefor “abbr” HTML element, along with a title(description), applications relying on the structure of your site, can do their job just fine.
Search engines will read the abbreviation and the description which increases the chance for more relevance by specific terms used on search engines like Google.

Abbreviations

Wrap abbreviations in proper HTML abbr tags for better SEO and accessibility.

Chetan Kunte

Encloses capitalized words with three or characters more within <code><abbr> </abbr></code> tags, so that abbr tags could be styled to display small caps—for typographical effect.

Small caps

Encloses capitalized words within abbr tags, so that abbr tags could be styled to display small caps—for typographical effect.

Abbreviations vs Small caps