JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="text" tabindex="1"><br>
    <input type="text" tabindex="2"><br>
    <input type="text" tabindex="3"><br>
    <input type="text" tabindex="4"><br>
</form>

CSS

input:focus
{ 
    background-color:yellow;
}

JavaScript

$(function () {
    $("*[tabindex='3']").focus();
});