The world of technology is littered with three-letter-acronyms and other abbreviations. Rather than provide the full term in brackets after an abbreviation, the option to use the <abbr> tag should be used in HTML5.
The following HTML:
<p>The <abbr title="Computer Applications Technology">PAT</abbr> is a crucial part of the <abbr title="Computer Applications Technology">CAT</abbr></p>
results in the following in a webpage:
The PAT is a crucial part of the CAT
value provided for the
title attribute of the tag will appear as a screen-tip when the user hovers over the tagged abbreviation in a browser.
<abbr> tag is not in the CAT curriculum and should score you an extra mark if you use it correctly in the Phase 3 HTML website section.