Cacher is the code snippet organizer for pro developers

function intersection(elementA, elementB){
  var a = elementA.getBoundingClientRect(),
    b = elementB.getBoundingClientRect();
  var overlap = (a.left <= b.right &&
    b.left <= a.right &&
    a.top <= b.bottom &&
    b.top <= a.bottom);
    return overlap;
}