Use the <datalist> element for input suggestions

HTML5 has a <datalist> element which you can you use to create suggestions for inputs.

Just specify the list attribute on your input, whose value should correspond to the id of the datalist, and then populate your datalist with options:

<input list="programming-languages" id="programming-language-choice" name="programming-language-choice" />

<datalist id="programming-languages">
    <option value="Ruby">
    <option value="Elixir">
    <option value="Java">
</datalist>

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/datalist