(function (d) { var w = d.documentElement.offsetWidth, t = d.createTreeWalker(d.body, NodeFilter.SHOW_ELEMENT), b; while (t.nextNode()) { b = t.currentNode.getBoundingClientRect(); if (b.right > w || b.left < 0) { t.currentNode.style.setProperty('outline', '1px dotted red', 'important'); console.log(t.currentNode); } }; }(document));