The test passes if the rendering matches the reference image, except
for any differences in text due to CSS2 rules. Specifically:
The top rectangle is filled with an elliptical radial gradient,
with black in the center and orange at the outside edges of the rectangle.
The bottom rectangle is filled with a circular radial gradient,
with black in the center and orange at the top and bottom edges of the rectangle.
Outside the circular area, the rectangle is filled with plain orange.
