JSFiddle - React, Tailwind, and code Playground
HTML
<div id="div1">test</div>
CSS
#div1
{
position: absolute;
top: 350px;
border: 1px solid red;
height: 100px;
}
JavaScript
$(function(){
if (($("#div1").offset().top + $("#div1").height()) >= $(window).height()) {
alert("div is outside the window area");
}
});