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diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-allow.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-allow.html
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index 0000000000..9e67314923
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+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-allow.html
@@ -0,0 +1,66 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Check processing of allow attribute in nested browsing context</title>
+<link rel="author" title="Google" href="https://www.google.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-allow">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/browsing-the-web.html#initialise-the-document-object">
+<link rel="help" href="https://fullscreen.spec.whatwg.org/#fullscreen-enabled-flag">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id="log"></div>
+<script>
+  // This returns a data URL (cross-origin with the containing document) which
+  // advances a counter, and reports the counter value together with the
+  // document's fullscreenEnabled state, every time it receives a postMessage.
+  // Fullscreen itself is not important for this test, but the flag is a useful
+  // indicator of whether a policy-controlled-feature is allowed or denied.
+  function getSourceForCrossOriginPage(initial_count) {
+    var page_contents = "<html><body><script>var count="+initial_count+";window.addEventListener('message',function(){parent.postMessage({'count':count++,'fullscreenEnabled':document.fullscreenEnabled},'*');});</scr"+"ipt></body></html>";
+    return "data:text/html;base64,"+btoa(page_contents);
+  }
+
+  async_test(function(t) {
+    var iframe = document.createElement("iframe");
+    iframe.src = getSourceForCrossOriginPage(0);
+
+    iframe.addEventListener('load', function() {
+      // Request the fullscreenEnabled state whenever the frame loads
+      iframe.contentWindow.postMessage(true,"*");
+    });
+
+    window.addEventListener('message', this.step_func(function(msg) {
+      if (msg.data.count == 0) {
+        assert_false(msg.data.fullscreenEnabled, "Document inside cross-origin iframe without allow attribute should not have feature enabled");
+        iframe.setAttribute("allow", "fullscreen");
+        iframe.contentWindow.postMessage(true,"*"); // Request state again
+      } else if (msg.data.count == 1) {
+        assert_false(msg.data.fullscreenEnabled, "Feature should be denied when correct allow attribute is added, before reload");
+        iframe.src = getSourceForCrossOriginPage(2); // Reload the frame
+      } else if (msg.data.count == 2) {
+        assert_true(msg.data.fullscreenEnabled, "Feature should be allowed when correct allow attribute is added, after reload");
+        iframe.removeAttribute("allow");
+        iframe.contentWindow.postMessage(true,"*"); // Request state again
+      } else if (msg.data.count == 3) {
+        assert_true(msg.data.fullscreenEnabled, "Feature should be allowed when allow attribute is removed, before reload");
+        iframe.src = getSourceForCrossOriginPage(4); // Reload the frame
+      } else if (msg.data.count == 4) {
+        assert_false(msg.data.fullscreenEnabled, "Feature should be denied when allow attribute is removed, after reload");
+        iframe.setAttribute("allow", "payment");  // Set allow to an unrelated feature
+        iframe.src = getSourceForCrossOriginPage(5); // Reload the frame
+      } else if (msg.data.count == 5) {
+        assert_false(msg.data.fullscreenEnabled, "Feature should be denied with incorrect allow attribute");
+        iframe.setAttribute("allow", "payment;fullscreen");  // Include fullscreen again
+        iframe.src = getSourceForCrossOriginPage(6); // Reload the frame
+      } else if (msg.data.count == 6) {
+        assert_true(msg.data.fullscreenEnabled, "Feature should be allowed with complex allow attribute");
+        t.done();
+      } else {
+        assert_unreached();
+      }
+    }));
+
+    document.body.appendChild(iframe);
+  }, "iframe-cross-origin-allow");
+
+</script>