This video from the USA says about itself:
13 December 2011
Pieris rapae, also known as the Cabbage white or Brassica butterfly [or small white], completes its entire life cycle in this minimally-narrated video. Pieris rapae raised along with Wisconsin Fast Plants provide a rich example of interdependence and interrelatedness among organisms who share a habitat.
This morning, on the butterfly-bush, a small white butterfly.
Higher up, on the balcony, a spider had made its web on a plant.
The flowers attracted a hoverfly as well.
Was this a young spider? A male of a species in which females are bigger? Or just a small species?