tl;dr With CSS Masks, Animations, Triangles and some sweat, you can make this. Needs Webkit (sorry). Here’s the story: Stuart Langridge (@sil) threw down a challenge (possibly by accident) on Twitter: anybody think of a good way to do a circular countdown timer via css animations? An animated gif is doing my head in. it feels like I ought to be able to do this with radial gradients, if I were clev
![CSS Triangles + Animations = Pie Chart Spinner](https://cdn-ak-scissors.b.st-hatena.com/image/square/3e39417a6e8223deb43d6ab60d4afe9223240995/height=288;version=1;width=512/https%3A%2F%2Ftgvashworth.com%2Fimages%2Fsousa.jpg)