Animating an element's fill using <animate calcMode='discrete'> where the values list includes url() values causes the wrong values to be applied to the property. It seems that if the initial value of the 'fill' (the underlying value) does not have a url() value, then black is used instead of the paint server. If the initial value does have a url() value (which doesn't need to be the same URI reference as the value in the values list), then the animation is a bit strange: the url() value does result in the use of the paint server at that point, but for each subsequent value in the animation, the fill flickers briefly to the correct value but then reverts to using the paint server.
Hi Cameron, I think this animation works nowadays ; I couldn't see a difference from how FF and Opera handle it. Cheers, Rob.
Looks good now, thanks!