Hint.css is a tooltip library written completely in CSS. It’s originally written in SASS and uses only HTML/CSS to implement simple tooltips.
Hint.css also uses the Block-Element-Modifier (BEM) for modifiers. Once caveat with Hint.css is that transitions on pseudo elements is only available in Firefox currently. So this feature will not work in other browsers, but degrades gracefully in non-supporting browsers.
Demo:http:/ / kushagragour. in/ lab/ hint/
License: MIT License