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Unable to toolbar tip on mobile devices

I have toolbar title=toolbar content that works on Desktop. How do I get this to work on mobile?

For example,

Header 1 (?)

On desktop when mouse over (?) a tooltip pops up automatically.
I need to get (?) to display tooltip when user taps on (?).

Usually questions like this are best answered by heading over to MDN and taking a look at the specs. Since specs change, using a resource like MDN will always insure you are looking at the most current information. Whereas answers in a forum may only be relevant at that particular time.