This tests the 'color' property and the 'currentColor' value on fill, stroke, and stop-color properties.
Run the test. No interaction required.
There are three subtests. The first subtest, to the top left, is passed if the circle has a green fill. The second subtest, to the top right, is passed if the circle has a green stroke. The third subtest shows a rectangle with a gradient fill, which has three stops. The subtest is passed if central stop is green, fading off to blue to the left and pale yellow to the right.