diff --git a/css/properties/bottom.json b/css/properties/bottom.json
index cf64748199dd09..408ab87adddcef 100644
--- a/css/properties/bottom.json
+++ b/css/properties/bottom.json
@@ -82,6 +82,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset-block-end.json b/css/properties/inset-block-end.json
index 743653032b41ad..f983f2824aafc1 100644
--- a/css/properties/inset-block-end.json
+++ b/css/properties/inset-block-end.json
@@ -84,6 +84,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset-block-start.json b/css/properties/inset-block-start.json
index edce7aaee46a81..2a44ae8499dcf1 100644
--- a/css/properties/inset-block-start.json
+++ b/css/properties/inset-block-start.json
@@ -84,6 +84,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset-block.json b/css/properties/inset-block.json
index aefa9166f67893..ca5e638d88d86c 100644
--- a/css/properties/inset-block.json
+++ b/css/properties/inset-block.json
@@ -84,6 +84,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset-inline-end.json b/css/properties/inset-inline-end.json
index 9626fd7012c1a2..f78082496de9f8 100644
--- a/css/properties/inset-inline-end.json
+++ b/css/properties/inset-inline-end.json
@@ -84,6 +84,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset-inline-start.json b/css/properties/inset-inline-start.json
index 3359e4b76ee780..60c9f21a923ca8 100644
--- a/css/properties/inset-inline-start.json
+++ b/css/properties/inset-inline-start.json
@@ -84,6 +84,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset-inline.json b/css/properties/inset-inline.json
index 649edda43fce8c..9ea9114e0e50d1 100644
--- a/css/properties/inset-inline.json
+++ b/css/properties/inset-inline.json
@@ -84,6 +84,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/inset.json b/css/properties/inset.json
index fd6e8e14d2b73c..49e79bb779a280 100644
--- a/css/properties/inset.json
+++ b/css/properties/inset.json
@@ -77,6 +77,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position-3/#valdef-top-auto",
diff --git a/css/properties/left.json b/css/properties/left.json
index 2e1f6bbd17e274..6b7be1e3718ad5 100644
--- a/css/properties/left.json
+++ b/css/properties/left.json
@@ -81,6 +81,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position/#valdef-top-auto",
diff --git a/css/properties/margin-block-end.json b/css/properties/margin-block-end.json
index fb6887f9a09c37..09bcd0b5a1ad7a 100644
--- a/css/properties/margin-block-end.json
+++ b/css/properties/margin-block-end.json
@@ -37,6 +37,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/css/properties/margin-block-start.json b/css/properties/margin-block-start.json
index ffdda1c6138c02..94eb13ec91e010 100644
--- a/css/properties/margin-block-start.json
+++ b/css/properties/margin-block-start.json
@@ -37,6 +37,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/css/properties/margin-block.json b/css/properties/margin-block.json
index eddb6e745ded21..f4a9b9a3495f9c 100644
--- a/css/properties/margin-block.json
+++ b/css/properties/margin-block.json
@@ -37,6 +37,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/css/properties/margin-bottom.json b/css/properties/margin-bottom.json
index bcc4024df8450e..99a85754e1eaf1 100644
--- a/css/properties/margin-bottom.json
+++ b/css/properties/margin-bottom.json
@@ -44,6 +44,44 @@
             "deprecated": false
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "tags": [
diff --git a/css/properties/margin-inline-end.json b/css/properties/margin-inline-end.json
index e7d9c515594bf9..f0fe0656873680 100644
--- a/css/properties/margin-inline-end.json
+++ b/css/properties/margin-inline-end.json
@@ -71,6 +71,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/css/properties/margin-inline-start.json b/css/properties/margin-inline-start.json
index 2750a33f874f0f..dfc4af9ecc322b 100644
--- a/css/properties/margin-inline-start.json
+++ b/css/properties/margin-inline-start.json
@@ -71,6 +71,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/css/properties/margin-inline.json b/css/properties/margin-inline.json
index abcb5a8bac95de..ac0cb8e2073cd1 100644
--- a/css/properties/margin-inline.json
+++ b/css/properties/margin-inline.json
@@ -37,6 +37,44 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }
diff --git a/css/properties/margin-left.json b/css/properties/margin-left.json
index a82c674da2ad94..5af93d5999f69c 100644
--- a/css/properties/margin-left.json
+++ b/css/properties/margin-left.json
@@ -44,6 +44,44 @@
             "deprecated": false
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "tags": [
diff --git a/css/properties/margin-right.json b/css/properties/margin-right.json
index 8510fdb42489ba..4845fbe7d1c0eb 100644
--- a/css/properties/margin-right.json
+++ b/css/properties/margin-right.json
@@ -44,6 +44,44 @@
             "deprecated": false
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "tags": [
diff --git a/css/properties/margin-top.json b/css/properties/margin-top.json
index 75705514de3b19..52e51845b76768 100644
--- a/css/properties/margin-top.json
+++ b/css/properties/margin-top.json
@@ -44,6 +44,44 @@
             "deprecated": false
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "tags": [
diff --git a/css/properties/margin.json b/css/properties/margin.json
index 43283da0f4c9ab..a85ce35d3ca492 100644
--- a/css/properties/margin.json
+++ b/css/properties/margin.json
@@ -44,6 +44,44 @@
             "deprecated": false
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "tags": [
diff --git a/css/properties/right.json b/css/properties/right.json
index 846152f270db8f..688cb9fa114d42 100644
--- a/css/properties/right.json
+++ b/css/properties/right.json
@@ -81,6 +81,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position/#valdef-top-auto",
diff --git a/css/properties/top.json b/css/properties/top.json
index 606407c35ffb39..829a60f61a0403 100644
--- a/css/properties/top.json
+++ b/css/properties/top.json
@@ -82,6 +82,44 @@
             }
           }
         },
+        "anchor-size": {
+          "__compat": {
+            "description": "`anchor-size()`",
+            "spec_url": "https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
+        },
         "auto": {
           "__compat": {
             "spec_url": "https://drafts.csswg.org/css-position/#valdef-top-auto",
diff --git a/css/types/anchor-size.json b/css/types/anchor-size.json
index 8cb8cf3fb987ed..f800c7cc6d77c5 100644
--- a/css/types/anchor-size.json
+++ b/css/types/anchor-size.json
@@ -39,6 +39,43 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "inset_margin": {
+          "__compat": {
+            "description": "Valid in inset and margin property values.",
+            "tags": [
+              "web-features:anchor-positioning"
+            ],
+            "support": {
+              "chrome": {
+                "version_added": "132"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false
+              },
+              "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",
+              "webview_ios": "mirror"
+            },
+            "status": {
+              "experimental": true,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       }
     }