diff --git a/api/DOMStringList.json b/api/DOMStringList.json
index 56a0a70aed812a..6c158ccf34066d 100644
--- a/api/DOMStringList.json
+++ b/api/DOMStringList.json
@@ -29,10 +29,10 @@
             "version_added": true
           },
           "safari": {
-            "version_added": true
+            "version_added": "5.1"
           },
           "safari_ios": {
-            "version_added": true
+            "version_added": "5"
           },
           "samsunginternet_android": {
             "version_added": true
@@ -76,10 +76,10 @@
               "version_added": true
             },
             "safari": {
-              "version_added": true
+              "version_added": "5.1"
             },
             "safari_ios": {
-              "version_added": true
+              "version_added": "5"
             },
             "samsunginternet_android": {
               "version_added": true
@@ -124,10 +124,10 @@
               "version_added": true
             },
             "safari": {
-              "version_added": true
+              "version_added": "5.1"
             },
             "safari_ios": {
-              "version_added": true
+              "version_added": "5"
             },
             "samsunginternet_android": {
               "version_added": true
@@ -172,10 +172,10 @@
               "version_added": true
             },
             "safari": {
-              "version_added": true
+              "version_added": "5.1"
             },
             "safari_ios": {
-              "version_added": true
+              "version_added": "5"
             },
             "samsunginternet_android": {
               "version_added": true
diff --git a/api/DOMStringMap.json b/api/DOMStringMap.json
index a6df36cddd77ea..2e7c98fa17193b 100644
--- a/api/DOMStringMap.json
+++ b/api/DOMStringMap.json
@@ -30,10 +30,10 @@
             "version_added": true
           },
           "safari": {
-            "version_added": true
+            "version_added": "5.1"
           },
           "safari_ios": {
-            "version_added": true
+            "version_added": "5"
           },
           "samsunginternet_android": {
             "version_added": true