Re: [Page Visibility] Spec -- privacy concern

On Fri, May 13, 2011 at 16:50, Kyle Simpson <getify@gmail.com> wrote:
> One major privacy concern I (and others I chatted with on Mozilla's
> #developers IRC) have is that third-party scripts (like ad providers, etc)
> would be able to monitor this type of data (page visibility) and gain
> valuable (to them!) information which a user might not want them to have,
> such as how long I stay viewing a page, etc.

Doesn't this privacy concern also apply to other existing mechanisms,
such as window.onblur/onfocus/onpageshow/onpagehide? It's not clear to
me that the visibility API introduces additional privacy-violating
capabilities on top of those.