CSS3 Tooltips For WordPress is a lightweight, easy-to-use tooltips plugin for WordPress. It’s based on pure CSS3 and comes loaded with 50 predefined CSS3 styles, 10 different tooltip positions, optional tooltip headers, support for images and videos, adjustable delay, notification icons, tooltips On Hover over element and On Click and support for mobile devices. Plugin comes with shortcode generator and global settings with nice feature to display CSS3 Tooltips for all links by default.
Demo: https://codecanyon.net/item/css3-tooltips-for-wordpress/7416713