diff --git a/css/properties/custom-property.json b/css/properties/custom-property.json
index dcae949f794afb..b4e589db4e72c8 100644
--- a/css/properties/custom-property.json
+++ b/css/properties/custom-property.json
@@ -208,12 +208,26 @@
               "opera": {
                 "version_added": null
               },
-              "safari": {
-                "version_added": "11.1"
-              },
-              "safari_ios": {
-                "version_added": "11.1"
-              }
+              "safari": [
+                {
+                  "version_added": "11.1"
+                },
+                {
+                  "version_added": "11",
+                  "version_removed": "11.1",
+                  "alternative_name": "constant"
+                }
+              ],
+              "safari_ios": [
+                {
+                  "version_added": "11.1"
+                },
+                {
+                  "version_added": "11",
+                  "version_removed": "11.1",
+                  "alternative_name": "constant"
+                }
+              ]
             },
             "status": {
               "experimental": true,