JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>

CSS

div {
    width:100px;
    height:100px;
    background:#ccc;
}
div:nth-child(2) {
    margin-left:50px;
    margin-top:50px;
}
div:nth-child(3) {
    margin-left:100px;
    margin-top:100px;
}
div:nth-child(4) {
    margin-left:150px;
    margin-top:150px;
}
div:nth-child(5) {
    margin-left:200px;
    margin-top:200px;
}
div:nth-child(6) {
    margin-left:850px;
    margin-top:250px;
}
.atencao {
    background:red;
    box-shadow:0 0 0 20px yellow, 0 0 0 5px white inset;
}

JavaScript

function escanearPagina(el) {
    var i = [],
        t, x, y, w, h,
        ww = $(window).width(),
        wh = $(window).height();

    el.each(function () {
        t = $(this);
        x = t[0].offsetLeft;
        y = t[0].offsetTop;
        w = t.outerWidth();
        h = t.outerHeight();

        if (w > ww || +x + w > ww || h > wh || +y + h > wh) {
            i.push(t[0]);
        }
    });
    return i;
}

//roda a função
var resultado = escanearPagina($('body *'));
$(resultado).addClass('atencao');