Expanding autocomplete in the WordPress admin
Autocomplete is not a new concept in the WordPress admin – tags have had suggestions powered by suggest.js since their introduction six years ago in version 2.5. This, however, remained the only instance of Ajax-powered autocompletion for another four years, until adding users in multisite was enhanced with jQuery UI autocomplete for 3.4. It was originally committed with deliberately unpolished styling, so when I saw a request to make it look better, I decided to take it on. I may not consider myself a creative designer, but I do have an eye and passion for UI consistency. After a little iteration on both the design and code, we had a fully functional instance of autocomplete.