Scaling is equivalent to the matrix [sx 0 0 xy 0 0], where one unit in the X and Y directions in the new coordinate system equals 'sx' and 'sy' units in the previous coordinate system respectively.The test overlays a group of black graphics elements with a 'scale' transform specified on top of an identical group of red elements with the equivalent 'matrix' transform and vice versa.
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Test passes if there is no red visible on the page.