I don't know what their implementation is, but for people who need a workaround for PNG export, the IE browser does not have this problem. If you open the attached SVG file on IE you will see the pentagon "pixels" render seamlessly without blending with the solid fill background. PNG export also produces a correct output.
I have confirmed this workaround so far only on IE. It does not work on Chrome, for example.
I don't know what their implementation is, but for people who need a workaround for PNG export, the IE browser does not have this problem. If you open the attached SVG file on IE you will see the pentagon "pixels" render seamlessly without blending with the solid fill background. PNG export also produces a correct output.
I have confirmed this workaround so far only on IE. It does not work on Chrome, for example.