Build pure CSS tooltips with no JavaScript — customize position, colors, arrow, size and animation, then copy the ready-to-use code.
CSS tooltips work by combining position: absolute on the tooltip element with :hover on the parent wrapper. The arrow is a zero-width, zero-height element made visible using the CSS border trick — only one side gets a color, turning the opposing transparent borders into a triangle. No JavaScript is needed for show/hide. For accessibility, prefer role="tooltip" and aria-describedby on the trigger element — hover-only tooltips are invisible to keyboard users. Add :focus-within .tooltip { opacity: 1 } to the wrapper to also show the tooltip on keyboard focus.