Native Client Voronoi demo mixed with overlapping Javascript canvases. The red circle on the left should appear behind the animated Voronoi demo, with only half of it being visible. The blue circle on the right should appear to be in front of the animated Voronoi demo, with the entire circle being visible.
The rendering is incorrect if: only half a blue circle is visible, the entire red circle is visible, or either circle flickers at any time.