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> A leash and blinders are put on an animal which is not free, to control it. But nobody is proposing removing your freedom to use any web browser you want. In what way is that metaphor applicable?

As I said, there is an inherent bias in the choice of analogy. The ones I present are just as vague and useless as yours and present an opposite bias.

> I suppose it depends on how one defines "type". I'm not just thinking of the "java.lang.String" level, but the broader level of anything that can be checked by a compiler, without evaluating it.

How did I give you the impression that this is the level I was addressing it on? URIs have a much more restrictive type than simply a sequence of characters.

> Consider the basic problem of navigating a link. We get a big stream of bytes from the network. It's pretty easy for the computer to identify URIs in it, by the syntax of HTML and CSS and URIs themselves. It's not an easy problem for humans -- I wouldn't trust myself to always accurately identify URIs in an arbitrary buffer! It's hard to tell what's a valid URI, or where (say) the URI ends and a color or some raw text begins. That's a type problem, and humans are bad at it.

It's an easy job for the browser simply not to accept malformed URIs. Unfortunately, browsers like Chromium deliberately accept entirely malformed URIs and even interpret valid URIs the wrong way. IMO that would be a good place to start looking if you had a genuine interest in improving security.

> This project sounds like the next level beyond that. My computer can already parse the stream and analyze it to find the URI, and automatically paste it in my URL bar when I click near it. Nifty. But "URI" is a richly structured type (just look at the URI class in your favorite programming language), and the browser can do far more with it, even just at the UX level, than simply treating it as an opaque string.

Yes, because it is well defined what a URI consists of this is easy. Chromium already does to color highlight the different parts of the URI.

> What's the difference between viewing the source of some malicious code, and running that malicious code? Only the type system: it's in a SCRIPT tag, or a PRE tag. What's the difference between seeing a malicious link, and following that malicious link? Pretty much the same thing.

So what is Google doing to address this that has anything to do with the type of URIs? Absolutely nothing.

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