In reply to Coded Art.

Amanda's link is best in class.

I'd tack on this make.wordpress.org/accessibility/ post that summarized the tickets removing the title attribute in core:
https://make.wordpress.org/accessibility/2013/08/09/title-attributes-galore/

And now that I review it, the WP Tavern article on this change is great too! https://wptavern.com/how-to-restore-the-link-title-attribute-removed-in-wordpress-4-2

And finally, the trac ticket to remove it: https://core.trac.wordpress.org/ticket/28206

I can't vouch for the usability and accessibility of any of them, but there do seem to be quite a few tooltip plugins for those that feel they "have" to have the title attribute.