That’s similar to what I saw. However, the mispaint was black (like default css text). The mispaint was “contained” to the area of the element which I targeted for a texture (a rotated form). The mispaint was filled splotches which flickered near the controls on pointer events. Of course, I was redrawing on events, but not back to the source form. If I hard-refreshed the page, there would be new splotch shapes in the same area with roughly the same visual weight.