If I have an article or blog post and I have an abbreviation or acronym such as SAD (Seasonal Affective Disorder) should I do this everytime the acronym SAD appears in a document?
<abbr title="Seasonal Affective Disorder">SAD</abbr>
If you do only define it once, does it have to be the very first time the abbreviation appears or could it be the 3rd or 4th time?
The <abbr> tag defines an abbreviation or an acronym, like "HTML", "CSS", "Mr.", "Dr.", "ASAP", "ATM". Tip: Use the global title attribute to show the description for the abbreviation/acronym when you mouse over the element.
The <abbr> HTML element represents an abbreviation or acronym.
Introducing acronyms Introduce every acronym before using it in the text. The first time you use the term, put the acronym in parentheses after the full term. Thereafter, you can stick to using the acronym.
It may consist of a group of letters or words taken from the full version of the word or phrase; for example, the word abbreviation can itself be represented by the abbreviation abbr., abbrv., or abbrev.; NPO, for nil (or nothing) per (by) os (mouth) is an abbreviated medical instruction.
As per Wikipedias Manual of Style you should only explain an abbreviation once. I would extend this to your case as well and only use the abbreviation on first occurence.
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