Well, as I recall, several of the questioners at that session were verging on the point of heckling, so many of the responses were short. But the answer is tha

Well, as I recall, several of the questioners at that session were verging on the point of heckling, so many of the responses were short. But the answer is that permitting mixed content was probably a mistake in the first place, but it's one that we have to live with. The ease of mixing content means that many sites get it wrong (including Google sites, to our shame) and the lack of ubiquitous SSL (again, including some Google sites) imposes that on others. So, I suppose that `we don't consider it a problem' is roughly correct regarding warning dialogs: the answer is not to mix content. The problem is that it's clearly too difficult to do that. (The inability of networks to cache public resources over HTTPS is also an issue and possibly one which we'll address.) Lack of SSL on the Chart's API is a new one, but I'll look into it now that I know that it's a problem. As for the rest of the problem: fixing stuff is hard. Miraculous answers invariably tend to be so only in the eyes of the conceiver. We'll keep plugging away.