diff --git a/css/at-rules/media.json b/css/at-rules/media.json
index 180b6e6409e18f..faf96182279f8d 100644
--- a/css/at-rules/media.json
+++ b/css/at-rules/media.json
@@ -1528,55 +1528,6 @@
             }
           }
         },
-        "prefers-reduced-transparency": {
-          "__compat": {
-            "description": "<code>prefers-reduced-transparency</code> media feature",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@media/prefers-reduced-transparency",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": true,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
         "resolution": {
           "__compat": {
             "description": "<code>resolution</code> media feature",
@@ -1654,111 +1605,6 @@
             }
           }
         },
-        "scan": {
-          "__compat": {
-            "description": "<code>scan</code> media feature",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@media/scan",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
-        "scripting": {
-          "__compat": {
-            "description": "<code>scripting</code> media feature",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@media/scripting",
-            "support": {
-              "chrome": {
-                "version_added": false,
-                "notes": "See <a href='https://crbug.com/489957'>bug 489957</a>."
-              },
-              "chrome_android": {
-                "version_added": false,
-                "notes": "See <a href='https://crbug.com/489957'>bug 489957</a>."
-              },
-              "edge": {
-                "version_added": false,
-                "notes": "See <a href='https://crbug.com/489957'>bug 489957</a>."
-              },
-              "firefox": {
-                "version_added": false,
-                "notes": "See <a href='https://bugzil.la/1166581'>bug 1166581</a>."
-              },
-              "firefox_android": {
-                "version_added": false,
-                "notes": "See <a href='https://bugzil.la/1166581'>bug 1166581</a>."
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false,
-                "notes": "See <a href='https://crbug.com/489957'>bug 489957</a>."
-              },
-              "webview_android": {
-                "version_added": false,
-                "notes": "See <a href='https://crbug.com/489957'>bug 489957</a>."
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
         "speech_type": {
           "__compat": {
             "description": "<code>speech</code> media type",
@@ -1807,55 +1653,6 @@
             }
           }
         },
-        "update": {
-          "__compat": {
-            "description": "<code>update</code> media feature",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@media/update-frequency",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
         "width": {
           "__compat": {
             "description": "<code>width</code> media feature",
diff --git a/css/at-rules/page.json b/css/at-rules/page.json
index 83a29e540a2437..8bbf002f965165 100644
--- a/css/at-rules/page.json
+++ b/css/at-rules/page.json
@@ -48,202 +48,6 @@
             "standard_track": true,
             "deprecated": false
           }
-        },
-        "bleed": {
-          "__compat": {
-            "description": "<code>bleed</code> descriptor",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@page/bleed",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
-        "marks": {
-          "__compat": {
-            "description": "<code>marks</code> descriptor",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@page/marks",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
-        "page-margin-boxes": {
-          "__compat": {
-            "description": "Page-margin boxes",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@page#page-margin-box",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
-        "size": {
-          "__compat": {
-            "description": "<code>size</code> descriptor",
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@page/size",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
         }
       }
     }
diff --git a/css/at-rules/viewport.json b/css/at-rules/viewport.json
index 1f723f1f4a18b8..093198a5619bd5 100644
--- a/css/at-rules/viewport.json
+++ b/css/at-rules/viewport.json
@@ -663,55 +663,6 @@
             }
           }
         },
-        "viewport-fit": {
-          "__compat": {
-            "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@viewport/viewport-fit",
-            "description": "<code>viewport-fit</code> descriptor",
-            "support": {
-              "chrome": {
-                "version_added": false
-              },
-              "chrome_android": {
-                "version_added": false
-              },
-              "edge": {
-                "version_added": false
-              },
-              "firefox": {
-                "version_added": false
-              },
-              "firefox_android": {
-                "version_added": false
-              },
-              "ie": {
-                "version_added": false
-              },
-              "opera": {
-                "version_added": false
-              },
-              "opera_android": {
-                "version_added": false
-              },
-              "safari": {
-                "version_added": false
-              },
-              "safari_ios": {
-                "version_added": false
-              },
-              "samsunginternet_android": {
-                "version_added": false
-              },
-              "webview_android": {
-                "version_added": false
-              }
-            },
-            "status": {
-              "experimental": false,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
         "width": {
           "__compat": {
             "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/@viewport/width",