The test passes if the rendering matches the reference image, apart
from any differences in font choice due to CSS2 rules. Specifically:
The top rectangle is filled with a linear gradient from blue on the left,
to lime in the middle. The right half of the rectangle is filled with plain lime.
The middle rectangle is filled with an elliptical radial gradient with
black on the inside and orange on the outside. The center point of the gradient
is near the center-bottom of the rectangle. The gradient is skewed, so that it appears
as a rotated elliptical gradient.
The bottom rectangle is filled with a repeating pattern of tiled
red, green, yellow and blue parallelograms.
