Can screen readers read abbreviations?
In general, screen readers do not recognize abbreviations and acronyms, and generally read them as if they were typical English words. For instance the acronym "ITS" would not be read by screen readers as the intended "I.T.S.", but as "It's".
Is abbr accessible?
As abbr is used for acronyms and abbreviations you should use the CSS property speak:spell-out to announce that an element must be spelled-out. You can use abbr tag to semantically indicate that it's an abbreviation or an acronym, but it won't have any effect on the global accessibility.
Does abbr mean abbreviation yes or no?
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.