If it's experimental, I don't think either Adobe or Google can be blamed for the fact they don't work. Naturally the css doesn't degrade – the browser is advertising support for a feature that's currently broken in the browser and thus disabled by default.

I was asking if the parent was using the experimental feature and wondering if it worked for him because of it. I am not using the experimental feature.

Of course samples are only samples, but they would be better if they showed a real life scenario where you have to make it work for the current generation of browsers and the upcoming generation. You don't have to degrade it with CSS, just make it work somehow.