code: def _box_in_box(el, child):
      
      return all([
          float(el.get('x0')) <= float(child.get('x0')),
          float(el.get('x1')) >= float(child.get('x1')),
          float(el.get('y0')) <= float(child.get('y0')),
          float(el.get('y1')) >= float(child.get('y1')),
      ])
docs: Return True if child is contained within el.