Getting Started With The Popover API - Smashing Magazine

"On the surface, a tooltip is simple. Hover or focus on an element, show a little box with some text, then hide it when the user moves away. But once you ship one to real users, the edges start to show. Keyboard users Tab into the trigger, but never see the tooltip. Screen readers announce it twice, or not at all. The tooltip flickers when you move the mouse too quickly. It overlaps content on smaller screens. Pressing Esc does not close it. Focus gets lost."

"Over time, my tooltip code grew into something I didn't really want to own anymore. Event listeners piled up. Hover and focus had to be handled separately. Outside clicks needed special cases. ARIA attributes had to be kept in sync by hand. Every small fix added another layer of logic."

"The Popover API turns tooltips from something you simulate into something the browser actually understands. Opening and closing, keyboard interaction, Escape handling, and much of the accessibility now come from the platform itself, not from ad-hoc JavaScript."

Building tooltips traditionally required JavaScript libraries due to numerous edge cases and accessibility challenges. Manual implementations struggle with keyboard navigation, screen reader announcements, flickering, overlapping content, focus management, and Escape key handling. As tooltip code accumulated event listeners and workarounds, maintaining these components became burdensome. The Popover API transforms this by making tooltips a native browser feature, shifting responsibility for opening, closing, keyboard interaction, Escape handling, and accessibility from ad-hoc JavaScript to the platform itself. This approach eliminates the need to understand complex library internals while providing robust, standardized behavior across browsers.

Read at Smashing Magazine