JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" id="checker">
    
    <div id="dependent-box">
        Show me when checked!
    </div>

JavaScript

$(document).ready(function () {
        var checkbox = $('#checker'); 
        var dependent = $('#dependent-box');
        if (checkbox.attr('checked') !== undefined){
           dependent.show();
        } else {
            dependent.hide();
        }
        
        checkbox.change(function(e){
           dependent.toggle(); 
        });
    });