JSFiddle - React, Tailwind, and code Playground
JavaScript
console.log(jQuery('<input class="baseopt basemainopt" type="checkbox" value="1" disabled="disabled" checked="">').appendTo(document.body).attr('checked') );
console.log(jQuery('<input class="baseopt basemainopt" type="checkbox" value="1" disabled="disabled" checked="">').appendTo(document.body).attr('checked') );