(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));
Bookmarklet
javascript:(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));
Awesome! Saved my day!