JSFiddle - React, Tailwind, and code Playground
HTML
<select id="list">
<option value="v">Volvo</option>
<option value="s">Saab</option>
<option value="o">Opel</option>
<option value="a">Audi</option>
</select>
JavaScript
document.getElementById("list").options[1].selected = true;
// this sets "saab" option as true.
// or...
//document.getElementById("list").value = "s"; // ID, not innerHTML.