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see also: https://www.w3.org/WAI/PF/Group/track/issues/751 in, ARIA 1.1 Name Computation, step 2H says to use "tooltip attributes." Is the “tooltip attribute” for HTML is just @title, or are there more? Is there a full tooltip computation? If there's a computation, where is it documented?' Please add a clearly labeled list of tooltip attributes, and, if appropriate, steps for calculating tooltips.
HTML AAM is no longer an ARIA Deliverable. If you wish to pursue this issue please file at https://github.com/w3c/html-aam/issues