This tests that zero opacity pixels in a mask do not affect hit testing for the purpose of pointer event targetting.
After loading the test, a rectangle will be displayed. Move the pointer over the rectangle, and it will change color to indicate whether the test was passed.
If the rectangle turns green once the pointing device is moved over it, the test was passed. If instead it turns red (or remains black), then the test failed. If the rectangle was initially red when the document was loaded, then that also indicates that the test failed.