diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index 5d7da2139f43..c842bb134d0f 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -554949,7 +554949,7 @@
    "support"
   ],
   "feature-policy/feature-policy-frame-policy-allowed-for-self.https.sub.html": [
-   "7a68af16b8cb8292185997cefdfeb3be295813a7",
+   "fdc37b6a3d16b35095a05b2857faeaf3d28c1feb",
    "testharness"
   ],
   "feature-policy/feature-policy-frame-policy-allowed-for-self.https.sub.html.sub.headers": [
@@ -555129,7 +555129,7 @@
    "support"
   ],
   "feature-policy/resources/featurepolicy.js": [
-   "87607362a81716400d9fee10958893e7a785f74e",
+   "a95ee6fc23217f5fc271763f5363a09b0ff04537",
    "support"
   ],
   "feature-policy/resources/picture-in-picture.js": [
diff --git a/testing/web-platform/tests/feature-policy/feature-policy-frame-policy-allowed-for-self.https.sub.html b/testing/web-platform/tests/feature-policy/feature-policy-frame-policy-allowed-for-self.https.sub.html
index d757d4c4cf51..d71a09f9a9a7 100644
--- a/testing/web-platform/tests/feature-policy/feature-policy-frame-policy-allowed-for-self.https.sub.html
+++ b/testing/web-platform/tests/feature-policy/feature-policy-frame-policy-allowed-for-self.https.sub.html
@@ -28,6 +28,24 @@
     test_frame_policy('fullscreen', cross_origin_src, false);
   }, 'Test frame policy on cross origin iframe inherit from header policy.');
 
+  // Test that frame policy can be used for sandboxed frames
+  test(function() {
+    test_frame_policy(
+      'fullscreen', same_origin_src, false, undefined, false, true);
+    }, 'Test frame policy on sandboxed iframe with no allow attribute.');
+  test(function() {
+    test_frame_policy(
+      'fullscreen', same_origin_src, true, 'fullscreen', false, true);
+    }, 'Test frame policy on sandboxed iframe with allow="fullscreen".');
+  test(function() {
+    test_frame_policy(
+      'fullscreen', same_origin_src, true, 'fullscreen \'src\'', false, true);
+    }, 'Test frame policy on sandboxed iframe with allow="fullscreen \'src\'".');
+  test(function() {
+    test_frame_policy(
+      'fullscreen', cross_origin_src, false, 'fullscreen ' + cross_origin, false, true);
+    }, 'Test frame policy on sandboxed iframe with allow="fullscreen ' + cross_origin + '".');
+
   // Test frame policy with allow attribute set to be one of the policies above.
   for (var i = 0; i < policies.length; i++) {
     test(function() {
diff --git a/testing/web-platform/tests/feature-policy/resources/featurepolicy.js b/testing/web-platform/tests/feature-policy/resources/featurepolicy.js
index be8629d153dc..bf7693fd1b96 100644
--- a/testing/web-platform/tests/feature-policy/resources/featurepolicy.js
+++ b/testing/web-platform/tests/feature-policy/resources/featurepolicy.js
@@ -393,8 +393,10 @@ function test_subframe_header_policy(
 //     test_expect: boolean value of whether the feature should be allowed.
 //     allow: optional, the allow attribute (container policy) of the iframe.
 //     allowfullscreen: optional, boolean value of allowfullscreen attribute.
+//     sandbox: optional boolean. If true, the frame will be sandboxed (with
+//         allow-scripts, so that tests can run in it.)
 function test_frame_policy(
-    feature, src, test_expect, allow, allowfullscreen) {
+    feature, src, test_expect, allow, allowfullscreen, sandbox) {
   let frame = document.createElement('iframe');
   document.body.appendChild(frame);
   // frame_policy should be dynamically updated as allow and allowfullscreen is
@@ -406,6 +408,9 @@ function test_frame_policy(
   if (!!allowfullscreen) {
     frame.setAttribute('allowfullscreen', true);
   }
+  if (!!sandbox) {
+    frame.setAttribute('sandbox', 'allow-scripts');
+  }
   frame.src = src;
   if (test_expect) {
     assert_true(frame_policy.allowedFeatures().includes(feature));