JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <select id="test" style="width: 99%">
        <option>Option 1</option>
        <option>Option 2</option>
    </select>
<div>

JavaScript

$(function () {
    $('#test').show();
    alert('Outer width when visible: ' + $('#test').outerWidth());
    $('#test').hide();
    alert('Outer width when hidden: ' + $('#test').outerWidth());
});