WCAG requires interactive content to be reachable by keyboard — Tooltip content isn't reliably focusable, so keep it passive and under ~25 words. Popover is click-triggered and can hold rich, interactive content. HoverCard previews on hover without requiring a click.
Hover or focus the button. No interactive content lives inside.
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Native Popover API — keyboard-dismissible, holds a real form control.
Ada Lovelace
Engineering · joined 2019
Preview only — the real destination is still the link itself.