UPDATE: It seems my use of
<script async>
optimization for Raphaël busted the inline slopegraph generation. Will work on tweaking the example posts to wait for Raphaël to load when I get some time.
So, I had to alter this to start after a user interaction. It loaded fine as a static, local page but seems to get a bit wonky embedded in a complex page. I also see some artifacts in Chrome but not in Safari. Still, not a bad foray into basic animation.