diff --git a/api/HTMLAnchorElement.json b/api/HTMLAnchorElement.json
index 757b2896e57b66..2bb98c2071b907 100644
--- a/api/HTMLAnchorElement.json
+++ b/api/HTMLAnchorElement.json
@@ -719,6 +719,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "rel": {
diff --git a/api/HTMLAreaElement.json b/api/HTMLAreaElement.json
index da646e8baf163d..4a4a23946f49c8 100644
--- a/api/HTMLAreaElement.json
+++ b/api/HTMLAreaElement.json
@@ -603,6 +603,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "rel": {
diff --git a/api/HTMLIFrameElement.json b/api/HTMLIFrameElement.json
index 58b78843517838..e2b25aa3718eb3 100644
--- a/api/HTMLIFrameElement.json
+++ b/api/HTMLIFrameElement.json
@@ -762,6 +762,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "sandbox": {
diff --git a/api/HTMLImageElement.json b/api/HTMLImageElement.json
index d4b52786893f22..cd4e891a8c05e7 100644
--- a/api/HTMLImageElement.json
+++ b/api/HTMLImageElement.json
@@ -882,6 +882,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "52"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "sizes": {
diff --git a/api/HTMLLinkElement.json b/api/HTMLLinkElement.json
index 35a6197639a63a..2dae765e7db17d 100644
--- a/api/HTMLLinkElement.json
+++ b/api/HTMLLinkElement.json
@@ -531,6 +531,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "58"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "50",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "58"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "50",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "58"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "50",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "rel": {
diff --git a/api/HTMLScriptElement.json b/api/HTMLScriptElement.json
index 00db95a5587e8e..db57089cef2910 100644
--- a/api/HTMLScriptElement.json
+++ b/api/HTMLScriptElement.json
@@ -489,6 +489,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "70"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "65",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "70"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "65",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "70"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "65",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "src": {
diff --git a/api/SVGAElement.json b/api/SVGAElement.json
index 411096053d77f8..bc05026f115dae 100644
--- a/api/SVGAElement.json
+++ b/api/SVGAElement.json
@@ -216,6 +216,108 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": false
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "61",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": false
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "rel": {
diff --git a/html/elements/a.json b/html/elements/a.json
index 2b566a81896015..01d4e66d34502f 100644
--- a/html/elements/a.json
+++ b/html/elements/a.json
@@ -468,6 +468,114 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "rel": {
diff --git a/html/elements/area.json b/html/elements/area.json
index 85411e0dedbd9d..4da3859f5c9aad 100644
--- a/html/elements/area.json
+++ b/html/elements/area.json
@@ -356,6 +356,114 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "rel": {
diff --git a/html/elements/iframe.json b/html/elements/iframe.json
index 278ba915fb03ed..1a440902a887f4 100644
--- a/html/elements/iframe.json
+++ b/html/elements/iframe.json
@@ -541,6 +541,114 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "sandbox": {
diff --git a/html/elements/img.json b/html/elements/img.json
index 1d453ad992c8f6..9ae30acbcb828a 100644
--- a/html/elements/img.json
+++ b/html/elements/img.json
@@ -591,6 +591,114 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "sizes": {
diff --git a/html/elements/link.json b/html/elements/link.json
index bf599d6f71f793..29a254f5f2a849 100644
--- a/html/elements/link.json
+++ b/html/elements/link.json
@@ -512,6 +512,114 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "50",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "rel": {
diff --git a/html/elements/script.json b/html/elements/script.json
index d9d6221f615cd8..cd190d639edb10 100644
--- a/html/elements/script.json
+++ b/html/elements/script.json
@@ -403,6 +403,126 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "70"
+                },
+                "chrome_android": "mirror",
+                "edge": {
+                  "version_added": "≤79"
+                },
+                "firefox": {
+                  "version_added": "65",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": {
+                  "version_added": true
+                },
+                "opera_android": {
+                  "version_added": null
+                },
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "70"
+                },
+                "chrome_android": "mirror",
+                "edge": {
+                  "version_added": "≤79"
+                },
+                "firefox": {
+                  "version_added": "65",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": {
+                  "version_added": true
+                },
+                "opera_android": {
+                  "version_added": null
+                },
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "70"
+                },
+                "chrome_android": "mirror",
+                "edge": {
+                  "version_added": "≤79"
+                },
+                "firefox": {
+                  "version_added": "65",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": {
+                  "version_added": true
+                },
+                "opera_android": {
+                  "version_added": null
+                },
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": "mirror",
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "src": {
diff --git a/http/headers/Referrer-Policy.json b/http/headers/Referrer-Policy.json
index 857ac4b1a8298e..e8924eb01e94d7 100644
--- a/http/headers/Referrer-Policy.json
+++ b/http/headers/Referrer-Policy.json
@@ -71,6 +71,86 @@
             }
           }
         },
+        "no-referrer-when-downgrade": {
+          "__compat": {
+            "description": "no-referrer-when-downgrade",
+            "support": {
+              "chrome": {
+                "version_added": "56"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "50",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "11.1",
+                "version_removed": "13"
+              },
+              "safari_ios": {
+                "version_added": "12",
+                "version_removed": "13"
+              },
+              "samsunginternet_android": {
+                "version_added": "7.2"
+              },
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
+        "origin-when-cross-origin": {
+          "__compat": {
+            "description": "origin-when-cross-origin",
+            "support": {
+              "chrome": {
+                "version_added": "56"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "50",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "11.1",
+                "version_removed": "13"
+              },
+              "safari_ios": {
+                "version_added": "12",
+                "version_removed": "13"
+              },
+              "samsunginternet_android": {
+                "version_added": "7.2"
+              },
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "same-origin": {
           "__compat": {
             "description": "same-origin",
@@ -181,6 +261,46 @@
               "deprecated": false
             }
           }
+        },
+        "unsafe-url": {
+          "__compat": {
+            "description": "unsafe-url",
+            "support": {
+              "chrome": {
+                "version_added": "56"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "50",
+                "version_removed": "92"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "11.1",
+                "version_removed": "13"
+              },
+              "safari_ios": {
+                "version_added": "12",
+                "version_removed": "13"
+              },
+              "samsunginternet_android": {
+                "version_added": "7.2"
+              },
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/svg/elements/a.json b/svg/elements/a.json
index 07c67d727a9cda..62bd70d554e3b5 100644
--- a/svg/elements/a.json
+++ b/svg/elements/a.json
@@ -212,6 +212,114 @@
               "standard_track": true,
               "deprecated": false
             }
+          },
+          "no-referrer-when-downgrade": {
+            "__compat": {
+              "description": "no-referrer-when-downgrade",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "52",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "origin-when-cross-origin": {
+            "__compat": {
+              "description": "origin-when-cross-origin",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "52",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
+          },
+          "unsafe-url": {
+            "__compat": {
+              "description": "unsafe-url",
+              "support": {
+                "chrome": {
+                  "version_added": "51"
+                },
+                "chrome_android": "mirror",
+                "edge": "mirror",
+                "firefox": {
+                  "version_added": "52",
+                  "version_removed": "92"
+                },
+                "firefox_android": "mirror",
+                "ie": {
+                  "version_added": false
+                },
+                "oculus": "mirror",
+                "opera": "mirror",
+                "opera_android": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror",
+                "samsunginternet_android": {
+                  "version_added": "7.2"
+                },
+                "webview_android": "mirror"
+              },
+              "status": {
+                "experimental": false,
+                "standard_track": true,
+                "deprecated": false
+              }
+            }
           }
         },
         "rel": {