In general, some very brief text describing things beyond just an animated GIF would be really helpful. I spent a long time watching the eyedropper one over and over, trying to figure out what exactly you did to get the eyedropper to show up. It doesn't help that this is apparently a feature that's only in canary for now (I'd avoid that, or at least call it out explicitly), but even ignoring that, trying to get instruction by watching a dot flick around unpredictably in a screenshot is difficult/inefficient.
edit: great idea for a site, though. I've subscribed to your RSS.
edit: great idea for a site, though. I've subscribed to your RSS.