diff --git a/web-share/disabled-by-permissions-policy-cross-origin.https.sub.html b/web-share/disabled-by-permissions-policy-cross-origin.https.sub.html
index 773da84c0c5bdd..fe56502845c3c4 100644
--- a/web-share/disabled-by-permissions-policy-cross-origin.https.sub.html
+++ b/web-share/disabled-by-permissions-policy-cross-origin.https.sub.html
@@ -9,6 +9,8 @@
     />
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
+    <script src="/resources/testdriver.js"></script>
+    <script src="/resources/testdriver-vendor.js"></script>
   </head>
   <body></body>
   <script>
diff --git a/web-share/resources/post-message.html b/web-share/resources/post-message.html
index 30134e2901fdfa..5f57a37dbf6dda 100644
--- a/web-share/resources/post-message.html
+++ b/web-share/resources/post-message.html
@@ -3,6 +3,8 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 <script>
+  test_driver.set_test_context(parent);
+
   window.addEventListener("message", async (event) => {
     const {
       data: { action, data },
