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Wikipedia uses two separate templates to generate tooltips. The {{abbr}} template is used to write an abbreviation (including an acronym or initialism) with its expanded meaning. It is a wrapper for the HTML element <abbr>...</abbr>. The {{tooltip}} template uses the <span>...</span> element to provide generic notes.
Only use {{abbr}} or <abbr> to mark up abbreviations (including acronyms and initialisms). Using it to generate tooltips elsewhere is a misuse of the underlying HTML and causes accessibility problems. For general-purpose tooltips, use {{tooltip}} instead.
Readers on mobile devices typically do not have a mouse to hover with, and so generally cannot see tooltip contents. As of 2023, more English Wikipedia page views occur on mobile than on desktop browsers.[1]