{
  "title":"Referrer Policy",
  "description":"A policy that controls how much information is shared through the HTTP `Referer` header. Helps to protect user privacy.",
  "spec":"https://www.w3.org/TR/referrer-policy/",
  "status":"cr",
  "links":[
    {
      "url":"https://blog.mozilla.org/security/2015/01/21/meta-referrer/",
      "title":"Mozilla security article"
    },
    {
      "url":"https://scotthelme.co.uk/a-new-security-header-referrer-policy/",
      "title":"A new security header: Referrer Policy"
    }
  ],
  "bugs":[
    
  ],
  "categories":[
    "Security"
  ],
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      "13.1":"a #3 #4",
      "14":"a #3 #4",
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      "2.3":"n",
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      "7.2-7.4":"a #3",
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      "10.1":"a #3",
      "11.1-11.2":"a #3",
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      "22":"y",
      "23":"y"
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  },
  "notes":"",
  "notes_by_num":{
    "1":"Browsers initially supported an [early draft](https://wiki.whatwg.org/wiki/Meta_referrer) of the specification which can only use a meta tag and is only compatible with the `origin` value from the new spec.",
    "2":"Chrome 21-60 did not support the `same-origin`, `strict-origin` and `strict-origin-when-cross-origin` values. ([issue 627968](https://bugs.chromium.org/p/chromium/issues/detail?id=627968))",
    "3":"Older browsers defaulted to `no-referrer-when-downgrade` which is unsafe. The default has been updated to `strict-origin-when-cross-origin` which is safe for most use cases. See [the revised spec.](https://github.com/w3c/webappsec-referrer-policy/pull/142)",
    "4":"[Safari's ITP](https://webkit.org/blog/9661/preventing-tracking-prevention-tracking/) (on by default) downgrades _all_ cross-site subresource request (not page navigation) `Referer` headers to the page's origin, ignoring the `unsafe-url`, `no-referrer-when-downgrade`, and `origin-when-cross-origin` referrer policies.",
    "5":"[Firefox 92+ ignores](https://bugzilla.mozilla.org/show_bug.cgi?id=1720294) the `unsafe-url`, `no-referrer-when-downgrade`, and `origin-when-cross-origin` referrer policies, defaulting to `strict-origin-when-cross-origin`."
  },
  "usage_perc_y":94.75,
  "usage_perc_a":3.14,
  "ucprefix":false,
  "parent":"",
  "keywords":"meta,referrer,referer",
  "chrome_id":"5639972996513792,6251880185331712",
  "shown":true
}