JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" Required="true" />
<input type="text" Required="true" style="display:none" />
<input type="text" />

JavaScript

$(document).ready(function(){
    var required = $("input[Required='true']").length;
    var visible = $("input:visible").length;
    var visibleRequired = $("input[Required='true']:visible").length;
    alert("Required: " + required + "\r\nVisible: " + visible + "\r\nVisible & required: " + visibleRequired);
});