role='combobox' and aria-expanded on the container. role='textbox', aria-autocomplete='list', aria-controls, aria-activedescendant on the input. role='option' and aria-selected on each suggestion. Update aria-expanded and aria-activedescendant via JavaScript.
Core (input, debounce 300ms, fetch, render, select, click-outside), advanced (keyboard nav, highlight, loading, no-results, caching, AbortController), accessibility (ARIA combobox/option), CSS (absolute, hover, highlighted, scroll), and testing (typing, debounce, keys, enter, escape, click-outside, no results, empty).
Input with suggestions list, debounce (300ms), fetch/filter suggestions, render dropdown, click to select, and click outside to close. These are the minimum. Keyboard navigation and highlighting are strong bonuses.
Keyboard navigation (arrow keys, enter, escape), highlight matching text, loading state, no results state, caching (Map), and AbortController for cancelling previous requests. These show depth and production-readiness.
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