Re: [whatwg/fetch] Add `Prefer: safe` HTTP header (Issue #1891)

12joan left a comment (whatwg/fetch#1891)

As others have pointed out, I don't like the idea of user agents proactively telling any website that the user visits, "Hey, this user is probably a child."

I can see a few advantages to the meta tag from a privacy perspective. Unlike a HTTP header, unscrupulous websites actually have to _use_ the meta tag in order to determine the user's content preference, which if implemented correctly should always display a visible message to the user. This means that websites can't glean this information without the user's knowledge.

With some extra work on user agents' part, it may even be possible to implement the meta tag without the website knowing it's being enforced. For example, the page could load normally and from the page's perspective behave normally, but all output from the site could be blocked from the user's perspective.

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