Async City Search
A debounced combobox fetches suggestions as you type, built with real `role="combobox"`/`aria-expanded` semantics — practice ARIA-role locators and waiting for async results.
Type a city name. Suggestions are debounced and arrive after a simulated network delay — stale responses for
an old query are discarded, so what you see always matches what you last typed. Built with real
role="combobox"/aria-expanded/aria-activedescendant semantics.