Operator script (click here to toggle)

The correct result should show:

• the top-left rectangle filled initially with a linear green-to-red gradient and turning into a solid green color after 5s.
• the top-right rectangle filled initially with a green gradient fully opaque on the left and half transparent on the right, but after 5s the rectangle should be filled with a fully opaque solid green.
• the bottom-left rectangle filled with a static green-to-black opaque gradient.
• the bottom-right rectangle initially filled with a green-to-yellow fully-opaque gradient animated and turning into a fully-opaque green solid color.