JSFiddle - React, Tailwind, and code Playground
HTML
<input id="test" type="checkbox"/>
JavaScript
console.log($('#test:checked').length);
$('#test').attr('checked', true);
console.log($('#test:checked').length);
$('#test').attr('checked', false);
console.log($('#test:checked').length);
$('#test').attr('checked', true);
console.log($('#test:checked').length);