If 'sy' is not specified for a 'scale' transform, it is assumed to be equal to 'sx'.
Specify a series of various red graphics elements. Specify an equivalent series of black graphics elements that are defined to have dimensions that are half the size as the red elements. Specify a 'transform' value of 'scale' with only the 'sx' value specified (i.e., 'scale(2)'). If the 'sy' parameter takes the same value as the 'sx', there will be no red on the page.
Run the test. No interaction required.
Test passes if there is no red visible on the page.