diff --git a/api/HTMLOptGroupElement.json b/api/HTMLOptGroupElement.json
index c090469bfeb4dc..99d5502a95b7c1 100644
--- a/api/HTMLOptGroupElement.json
+++ b/api/HTMLOptGroupElement.json
@@ -74,11 +74,21 @@
             "opera_android": {
               "version_added": "≤12.1"
             },
-            "safari": {
-              "version_added": "3"
-            },
+            "safari": [
+              {
+                "version_added": "7"
+              },
+              {
+                "version_added": "3",
+                "version_removed": "7",
+                "partial_implementation": true,
+                "notes": "The property can be set, but has no effect (see [bug 227042](https://webkit.org/b/227042))."
+              }
+            ],
             "safari_ios": {
-              "version_added": "1"
+              "version_added": "1",
+              "partial_implementation": true,
+              "notes": "The property can be set, but has no effect (see [bug 227042](https://webkit.org/b/227042))."
             },
             "samsunginternet_android": "mirror",
             "webview_android": "mirror",
diff --git a/html/elements/optgroup.json b/html/elements/optgroup.json
index 7cfa520bb53c50..994a6ff8461d03 100644
--- a/html/elements/optgroup.json
+++ b/html/elements/optgroup.json
@@ -66,9 +66,14 @@
               "opera": "mirror",
               "opera_android": "mirror",
               "safari": {
-                "version_added": "≤4"
+                "version_added": "7",
+                "notes": "Before Safari 7, the attribute can be set, but has no effect."
+              },
+              "safari_ios": {
+                "version_added": false,
+                "impl_url": "https://webkit.org/b/227042",
+                "notes": "The attribute can be set, but has no effect."
               },
-              "safari_ios": "mirror",
               "samsunginternet_android": "mirror",
               "webview_android": "mirror",
               "webview_ios": "mirror"