Re: [w3ctag/design-reviews] Require embedees to opt-in. (#578)

Thanks, @lknik! Reaching the long tail of sites is, indeed, important. I hope we'll be able to do so effectively via mechanisms like blog posts and tooling (devtools, lighthouse/observatory, deprecation reports, securityheaders.io and similar, etc). I don't think marking sites as unsafe because they embedded a page that didn't opt-in will be terribly effective, as the warning would seem to accrue to the wrong entity (embedder rather than embedee), but I'm open to additional ideas!

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