Even (b) is pushing IMO. There's a reason the standards have evolved to be this restrictive. If you want to allow a way to get around those restrictions (with "

Even (b) is pushing IMO. There's a reason the standards have evolved to be this restrictive. If you want to allow a way to get around those restrictions (with "you" being a browser vendor), then you should go through the standardization process. 9/10 these "good intentioned" additions to browsers end up being used in exploits, and even if they aren't just being in one browser is rarely useful.