JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">***</div>
<div id="div2">***</div>

JavaScript

$(function() {
    var is1 = $(window).is(':visible');
    var is2 = $(document).is(':visible');
    var is3 = $("#div1").is(':visible');
    //alert("is(':visible'): " + is1 + " " + is2 + " " + is3);
    $("#div1").html("is(':visible'): " + is1 + " " + is2 + " " + is3);

    var f1 = $(window).filter(':visible').length !== 0;
    var f2 = $(document).filter(':visible').length !== 0;
    var f3 = $("#div2").filter(':visible').length !== 0;
    //alert("filter(':visible'): " + f1 + " " + f2 + " " + f3);
    $("#div2").html("filter(':visible'): " + f1 + " " + f2 + " " + f3);
});