JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li tabindex="-1">One</li>
    <li tabindex="-1">Two</li>
    <li tabindex="-1">Three</li>
</ul>

CSS

li:focus
{
    color: #c00;
}

JavaScript

$( function()
{
    $( 'li:first-child' ).focus();
    alert( $( 'ul' ).find( 'li:focus' ).size() );
});