Tooltips seem simple, until you look closer. The title attribute can't be styled and isn't accessible to everyone, while custom tooltips come with plenty of complexity. What would it take to build a native tooltip that's customizable, accessible, and easy to use, from plain text to rich HTML?
Stop making tool tips, that’s the answer.
God I hate things that popup when I didn’t ask, just because I let my mouse hang out in one spot 0.002 seconds too long.