diff --git a/api/HTMLBaseElement.json b/api/HTMLBaseElement.json
index 7d75004e74aa92..882830adc90a89 100644
--- a/api/HTMLBaseElement.json
+++ b/api/HTMLBaseElement.json
@@ -81,6 +81,40 @@
             "standard_track": true,
             "deprecated": false
           }
+        },
+        "forbid_data_javascript_urls": {
+          "__compat": {
+            "description": "<code>data:</code> and <code>javascript:</code> urls are not allowed",
+            "support": {
+              "chrome": {
+                "version_added": false,
+                "impl_url": "https://crbug.com/40928991"
+              },
+              "chrome_android": "mirror",
+              "edge": "mirror",
+              "firefox": {
+                "version_added": "127"
+              },
+              "firefox_android": "mirror",
+              "ie": {
+                "version_added": false
+              },
+              "oculus": "mirror",
+              "opera": "mirror",
+              "opera_android": "mirror",
+              "safari": {
+                "version_added": "17.2"
+              },
+              "safari_ios": "mirror",
+              "samsunginternet_android": "mirror",
+              "webview_android": "mirror"
+            },
+            "status": {
+              "experimental": false,
+              "standard_track": true,
+              "deprecated": false
+            }
+          }
         }
       },
       "target": {
diff --git a/html/elements/base.json b/html/elements/base.json
index 65fb7eadda8781..0c8b583b6593ac 100644
--- a/html/elements/base.json
+++ b/html/elements/base.json
@@ -81,7 +81,7 @@
                 "chrome_android": "mirror",
                 "edge": "mirror",
                 "firefox": {
-                  "version_added": false
+                  "version_added": "127"
                 },
                 "firefox_android": "mirror",
                 "ie": {