Does "Isolation on intermediate element with transparent pixels" sound better?

It is similar, though the difference is that the blending and isolation is tested on the overlay of 3 layers, as opposed to the previous one where only the overflow portion is checked to not blend with the parent. The intent of the previous test is for the intermediate element to not have any transparent areas, even though this is not explicitly stated in the test. Anyway, I don't think an extra test will be harmful.