JSFiddle - React, Tailwind, and code Playground

HTML

<form name="cbform">
<input type="checkbox" value="1" name="one" id="one" /> one<br />
<input type="checkbox" value="1" name="two" id="two" /> two
</form>

JavaScript

$('#one, #two').click(function(event) {
    var checked = $(this).is(':checked');
    if (checked) {
        $('#one').attr('checked', true);
        $('#two').attr('checked', true);
        //$('#one, #two').toggle();
    }
    else {
        $('#one').attr('checked', false);
        $('#two').attr('checked', false);
    }
});