Any screen reflection will make it impossible to see signal ringing. It may help to help to cut a viewing shroud from a paper towel tube to reduce the field of view. Look for a decaying ripple pattern with period of twice the bar width. Flat panel and projector displays do not exhibit video signal ringing. Image Persistence - Interlaced CRT monitors which have pretty much disappeared, used a slow decay phosphor to reduce their inherent flicker effect.
Most current laptops have active matrix displays without any persistence or display lag issues.
So this test will be of interest to only a few. The test may not swap the image fast enough if view on a slow Internet connection. Tonal Resolution - This test determines the finest increment of tonal resolution in units of bits that can be detected for red, green, blue and white. The test is best performed with carefully controlled ambient conditions - a dark room and no screen reflections. The simple answer is, not very much.