JSFiddle - React, Tailwind, and code Playground
HTML
<input type="text" required />
JavaScript
var attr = $("input").attr("required");
var attrb = $("input").attr("required") === "required";
var prop = $("input").prop("required");
$("body").append("<br>attr: " + attr + "<br>prop: " + prop + "<br>attrb: " + attrb );