The header must confirm that site is age-appropriate. No header should be interpreted as "adults only". This is the safest option, and it doesn't require 99% of webmasters to do anything which is in my opinion better than any other proposal.
Exactly. That's the problem I have with the "restricted to adults" header. Ideally the header wouldn't have a "safe for kids" value either because what one parents feels is safe will be very different from what another parent would find appropriate. I think The Internet Content Rating Association had the right idea were the header would show if a site contained specific types of content or not and it was up to parents to decide how much to censor.
Exactly. That's the problem I have with the "restricted to adults" header. Ideally the header wouldn't have a "safe for kids" value either because what one parents feels is safe will be very different from what another parent would find appropriate. I think The Internet Content Rating Association had the right idea were the header would show if a site contained specific types of content or not and it was up to parents to decide how much to censor.