<dfn> Tag Attributes

Attributes of the <dfn> tag
global attributes In addition to the personal attributes of the <dfn> tag below, any of the common HTML attributes can also be coded.
id Including an id attribute allows additional uses of the same term to refer back to the defining instance of the term, without having to include the definition again.
title The title attribute identifies the term that is being defined. Do not use the title tag for the definition of the term or for the expanded meaning of an acronym or abbreviation when it is simply being expanded in the text that follows.
Unlike the common attribute of the same name, the title attribute of the <dfn> tag does not inherit its value from an ancestor tag. However, the title attribute of a child <abbr> tag will be used, which is appropriate when the term being defined is the expanded meaning of an acronym or abbreviation rather than the abbreviation itself.