diff --git a/css/selectors/active.json b/css/selectors/active.json
index 0ae04746f7c0c6..1b32350d267d50 100644
--- a/css/selectors/active.json
+++ b/css/selectors/active.json
@@ -95,6 +95,39 @@
               "deprecated": false
             }
           }
+        },
+        "top-layer_ancestor_matching_boundary": {
+          "__compat": {
+            "description": "Observes [top-layer ancestor matching boundary](https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary) behavior",
+            "spec_url": "https://www.w3.org/TR/selectors-4/#useraction-pseudos:~:text=they%20also%20match%20on%20the%20element%E2%80%99s%20flat%20tree%20ancestors%2C%20up%20to%20and%20including%20the%20first%20top%20layer%20element",
+            "support": {
+              "chrome": {
+                "version_added": "149"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false,
+                "impl_url": "https://bugzil.la/2025235"
+              },
+              "firefox_android": "mirror",
+              "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/selectors/focus-within.json b/css/selectors/focus-within.json
index 104752793c2163..13610f50dd045e 100644
--- a/css/selectors/focus-within.json
+++ b/css/selectors/focus-within.json
@@ -35,6 +35,39 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "top-layer_ancestor_matching_boundary": {
+          "__compat": {
+            "description": "Observes [top-layer ancestor matching boundary](https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary) behavior",
+            "spec_url": "https://www.w3.org/TR/selectors-4/#useraction-pseudos:~:text=they%20also%20match%20on%20the%20element%E2%80%99s%20flat%20tree%20ancestors%2C%20up%20to%20and%20including%20the%20first%20top%20layer%20element",
+            "support": {
+              "chrome": {
+                "version_added": "149"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false,
+                "impl_url": "https://bugzil.la/2025235"
+              },
+              "firefox_android": "mirror",
+              "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/selectors/hover.json b/css/selectors/hover.json
index 2a79984a7f6635..7589014e5cd13e 100644
--- a/css/selectors/hover.json
+++ b/css/selectors/hover.json
@@ -153,6 +153,39 @@
               "deprecated": false
             }
           }
+        },
+        "top-layer_ancestor_matching_boundary": {
+          "__compat": {
+            "description": "Observes [top-layer ancestor matching boundary](https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary) behavior",
+            "spec_url": "https://www.w3.org/TR/selectors-4/#useraction-pseudos:~:text=they%20also%20match%20on%20the%20element%E2%80%99s%20flat%20tree%20ancestors%2C%20up%20to%20and%20including%20the%20first%20top%20layer%20element",
+            "support": {
+              "chrome": {
+                "version_added": "149"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": false,
+                "impl_url": "https://bugzil.la/2025235"
+              },
+              "firefox_android": "mirror",
+              "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
+            }
+          }
         }
       }
     }