diff --git a/api/Permissions.json b/api/Permissions.json
index d8e68a9c629306..b91255faac361f 100644
--- a/api/Permissions.json
+++ b/api/Permissions.json
@@ -472,7 +472,14 @@
           "description": "`magnetometer` permission",
           "support": {
             "chrome": {
-              "version_added": "62"
+              "version_added": "62",
+              "flags": [
+                {
+                  "type": "preference",
+                  "name": "#enable-generic-sensor-extra-classes",
+                  "value_to_set": "Enabled"
+                }
+              ]
             },
             "chrome_android": "mirror",
             "edge": "mirror",
@@ -491,9 +498,7 @@
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",
-            "webview_android": {
-              "version_added": false
-            },
+            "webview_android": "mirror",
             "webview_ios": "mirror"
           },
           "status": {
diff --git a/html/elements/iframe.json b/html/elements/iframe.json
index d8c07265e23596..132cadee68a236 100644
--- a/html/elements/iframe.json
+++ b/html/elements/iframe.json
@@ -867,7 +867,14 @@
               ],
               "support": {
                 "chrome": {
-                  "version_added": "66"
+                  "version_added": "66",
+                  "flags": [
+                    {
+                      "type": "preference",
+                      "name": "#enable-generic-sensor-extra-classes",
+                      "value_to_set": "Enabled"
+                    }
+                  ]
                 },
                 "chrome_android": "mirror",
                 "edge": "mirror",
@@ -886,9 +893,7 @@
                 },
                 "safari_ios": "mirror",
                 "samsunginternet_android": "mirror",
-                "webview_android": {
-                  "version_added": false
-                }
+                "webview_android": "mirror"
               },
               "status": {
                 "experimental": true,