diff --git a/files/en-us/web/api/clients/openwindow/index.md b/files/en-us/web/api/clients/openwindow/index.md
index 2a08e39267c667a..65baf7e53958bf7 100644
--- a/files/en-us/web/api/clients/openwindow/index.md
+++ b/files/en-us/web/api/clients/openwindow/index.md
@@ -39,6 +39,15 @@ A {{jsxref("Promise")}} that resolves to a {{domxref("WindowClient")}} object if
 URL is from the same origin as the service worker or a {{Glossary("null", "null
   value")}} otherwise.
 
+### Exceptions
+
+- `InvalidAccessError` {{domxref("DOMException")}}
+  - : The promise is rejected with this exception if none of the windows in the app's origin have [transient activation](/en-US/docs/Web/Security/User_activation).
+
+## Security requirements
+
+- At least one window in the app's origin must have [transient activation](/en-US/docs/Web/Security/User_activation).
+
 ## Examples
 
 ```js
diff --git a/files/en-us/web/api/windowclient/focus/index.md b/files/en-us/web/api/windowclient/focus/index.md
index 01fbd91d8549fb4..57948d5b429d02c 100644
--- a/files/en-us/web/api/windowclient/focus/index.md
+++ b/files/en-us/web/api/windowclient/focus/index.md
@@ -27,6 +27,15 @@ None.
 
 A {{jsxref("Promise")}} that resolves to the existing {{domxref("WindowClient")}}.
 
+### Exceptions
+
+- `InvalidAccessError` {{domxref("DOMException")}}
+  - : The promise is rejected with this exception if none of the windows in the app's origin have [transient activation](/en-US/docs/Web/Security/User_activation).
+
+## Security requirements
+
+- At least one window in the app's origin must have [transient activation](/en-US/docs/Web/Security/User_activation).
+
 ## Examples
 
 ```js