CSS Test: One named flow, text content flowing into a simple region then into a multi-column region

The test passes if there is one green square and two vertical green rectangles to the right of it and no red.

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX