Suggestion for sensible online content

Hi

I work for a big telecom company in Canada that currently give various
sponsorship for mental health organisations. Part of the sponsorship is
making sites and mobile applications to help individual get online help and
access information and resources that are often sensible.

One example is  http://www.kidshelpphone.ca/ they provide anonymous phone
line for kids that may have issue or problem in their family. This lead to
a sensitive problem, a kid visiting this site need to know how to clean
browsing history since a adult seeing the browsing history might challenge
the kids about the visit and lead to more stress or bigger problems. They
did explain on the site header how to flush history and train visitor about
the anonymous tab, this isn't perfect at all, because it really entirely on
the user actions and the assumption that he read and understood the
section.

Since not all internet user are tech savvy and are aware of the anonymous
tabs, so my suggestion for the W3C would be the following:

A head meta tag that could help define sensitivity level of the online html
content. This tag once detected by the browser could apply various policy
to increase anonymity and reduce potential problems, ideally default
policies would implicitly insure higher privacy for the end users.

For instance browser that detect the meta tag could automatically go in
"anonymous mode" and don't track browsing history, remove cached content,
etc. This will insure a more anonymous browsing experience for such site
for users that are less aware of the already available privacy features.
Content rating meta tag to some extends could be used but this is a bit far
fetch but could be less involving since tags already exist.

Of course I'm quite sure, site with adult content would also be like such
features but this is not really the issue I'm trying to resolve at this
point.

According to some of the W3C members this is a valid place to submit this
suggestion, I hope this will be well received.

Regards,

Francois