Use the HTML <abbr> element to mark an abbreviation or acronym semantically. Add a title attribute when you want to provide its full form. section 16.1
A small expansion
Writing <abbr title="fear of missing out">FOMO</abbr> identifies the shortened term and supplies its expanded form. Browsers commonly show the title value in a tooltip when you hover, and some add a dotted underline. section 16.1
