function* poking() {
	let els = [...document.querySelectorAll('*')];
	for (let el of els) {
		let rect = el.getBoundingClientRect();
		if (rect.x + rect.width > window.innerWidth) {
			yield el;
		}
	}
};

// Usage:
let elements = poking();

elements.next().value // First matching element...
elements.next().value // Next matching element...
// and so on, until
elements.next().value // undefined (i.e. finished)