The Native Popover That Positions Itself

Stack Patterns — Episode 10 Every frontend team has written this code: a tooltip that appears on click, disappears when you click elsewhere, stays above the z-index of that one modal someone set to 9999, and kindly repositions itself when it hits the viewport edge. The result is typically Floating UI (35KB), three event listeners, a resize observer, and a quiet prayer. The browser now does all of it. Natively. Stable: The Popover API Baseline in every browser since April 2025. One attribute: <bu