From ef646d2bf43ef4d78fb9d47ed79cce4fa40c45f7 Mon Sep 17 00:00:00 2001
From: Chris Mills <chrisdavidmills@gmail.com>
Date: Sun, 7 Dec 2025 13:43:54 +0000
Subject: [PATCH 1/2] Firefox 147 support for activeViewTransition property

---
 api/Document.json |  2 +-
 api/Element.json  | 31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/api/Document.json b/api/Document.json
index 647285b5a002be..39f9c780b97147 100644
--- a/api/Document.json
+++ b/api/Document.json
@@ -257,7 +257,7 @@
             "chrome_android": "mirror",
             "edge": "mirror",
             "firefox": {
-              "version_added": false
+              "version_added": "147"
             },
             "firefox_android": "mirror",
             "oculus": "mirror",
diff --git a/api/Element.json b/api/Element.json
index fc6f338a3db538..cc8aa56a455c29 100644
--- a/api/Element.json
+++ b/api/Element.json
@@ -148,6 +148,37 @@
           }
         }
       },
+      "activeViewTransition": {
+        "__compat": {
+          "spec_url": "https://drafts.csswg.org/css-view-transitions-2/#dom-element-activeviewtransition",
+          "support": {
+            "chrome": {
+              "version_added": "142"
+            },
+            "chrome_android": "mirror",
+            "edge": "mirror",
+            "firefox": {
+              "version_added": "147"
+            },
+            "firefox_android": "mirror",
+            "oculus": "mirror",
+            "opera": "mirror",
+            "opera_android": "mirror",
+            "safari": {
+              "version_added": "26.2"
+            },
+            "safari_ios": "mirror",
+            "samsunginternet_android": "mirror",
+            "webview_android": "mirror",
+            "webview_ios": "mirror"
+          },
+          "status": {
+            "experimental": false,
+            "standard_track": true,
+            "deprecated": false
+          }
+        }
+      },
       "after": {
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/Element/after",

From 3bb892b8f5ac91669df5bd50349081af7fec487b Mon Sep 17 00:00:00 2001
From: Chris Mills <chrisdavidmills@gmail.com>
Date: Sun, 7 Dec 2025 14:55:27 +0000
Subject: [PATCH 2/2] Remove Element.activeViewTransition

---
 api/Element.json | 31 -------------------------------
 1 file changed, 31 deletions(-)

diff --git a/api/Element.json b/api/Element.json
index cc8aa56a455c29..fc6f338a3db538 100644
--- a/api/Element.json
+++ b/api/Element.json
@@ -148,37 +148,6 @@
           }
         }
       },
-      "activeViewTransition": {
-        "__compat": {
-          "spec_url": "https://drafts.csswg.org/css-view-transitions-2/#dom-element-activeviewtransition",
-          "support": {
-            "chrome": {
-              "version_added": "142"
-            },
-            "chrome_android": "mirror",
-            "edge": "mirror",
-            "firefox": {
-              "version_added": "147"
-            },
-            "firefox_android": "mirror",
-            "oculus": "mirror",
-            "opera": "mirror",
-            "opera_android": "mirror",
-            "safari": {
-              "version_added": "26.2"
-            },
-            "safari_ios": "mirror",
-            "samsunginternet_android": "mirror",
-            "webview_android": "mirror",
-            "webview_ios": "mirror"
-          },
-          "status": {
-            "experimental": false,
-            "standard_track": true,
-            "deprecated": false
-          }
-        }
-      },
       "after": {
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/Element/after",