JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="checkbox" value="1">1<br />
    <input type="checkbox" value="2">2<br /> 
    <input type="checkbox" value="3">3<br />
</form>

<div id="Output">
    
</div>

CSS

#Output {
    width: 100px;            
    margin:.5em;
    border: 1px dashed #ccc;
}

JavaScript

$('input').click(function(){
    if(this.checked) {
        $('#Output').text($('#Output').text() + $(this).val());
    } else {
    }
});