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diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-allowfullscreen.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-allowfullscreen.html
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+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-allowfullscreen.html
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+<!doctype html>
+<meta charset=utf-8>
+<title>Check how allowfullscreen affects fullscreen enabled flag</title>
+<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org">
+<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.
+  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 = "support/blank.htm";
+    var eventWatcher = new EventWatcher(t, iframe, "load");
+    document.body.appendChild(iframe);
+    t.add_cleanup(function() {
+      document.body.removeChild(iframe);
+    });
+
+    assert_true(document.fullscreenEnabled, "Top level document has fullscreen enabled flag set");
+    eventWatcher.wait_for("load").then(t.step_func_done(function() {
+      assert_true(iframe.contentDocument.fullscreenEnabled, "Document inside same-origin iframe without allowfullscreen attribute should still have fullscreen enabled flag set");
+    }));
+  }, "iframe-same-origin-allowfullscreen");
+
+  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 allowfullscreen attribute should not have fullscreen enabled flag set");
+        iframe.setAttribute("allowfullscreen", "");
+        iframe.contentWindow.postMessage(true,"*"); // Request state again
+      } else if (msg.data.count == 1) {
+        assert_false(msg.data.fullscreenEnabled, "Fullscreen should be denied when allowfullscreen attribute is added, before reload");
+        iframe.src = getSourceForCrossOriginPage(2); // Reload the frame
+      } else if (msg.data.count == 2) {
+        assert_true(msg.data.fullscreenEnabled, "Fullscreen should be allowed when allowfullscreen attribute is added, after reload");
+        iframe.removeAttribute("allowfullscreen");
+        iframe.contentWindow.postMessage(true,"*"); // Request state again
+      } else if (msg.data.count == 3) {
+        assert_true(msg.data.fullscreenEnabled, "Fullscreen should be allowed when allowfullscreen attribute is removed, before reload");
+        iframe.src = getSourceForCrossOriginPage(4); // Reload the frame
+      } else if (msg.data.count == 4) {
+        assert_false(msg.data.fullscreenEnabled, "Fullscreen should be denied when allowfullscreen attribute is removed, after reload");
+        t.done();
+      }
+    }));
+
+    document.body.appendChild(iframe);
+    t.add_cleanup(function() {
+      document.body.removeChild(iframe);
+    });
+  }, "iframe-cross-origin-allowfullscreen");
+
+  /* Fullscreen enabled flag with about:blank */
+
+  function test_allowfullscreen_noload(setup_iframe, check) {
+    var iframe = document.createElement("iframe");
+    setup_iframe(iframe);
+    document.body.appendChild(iframe);
+    check(iframe.contentDocument);
+    document.body.removeChild(iframe);
+  }
+
+  test(function() {
+    test_allowfullscreen_noload(function() {}, function(doc) {
+      assert_true(doc.fullscreenEnabled, "Fullscreen should still be enabled in same-origin document without allowfullscreen attribute");
+    });
+  }, "iframe-noload-noallowfullscreen");
+
+  test(function() {
+    test_allowfullscreen_noload(function(iframe) {
+      iframe.setAttribute("allowfullscreen", true);
+    }, function(doc) {
+      assert_true(doc.fullscreenEnabled, "Fullscreen should be enabled with allowfullscreen attribute");
+    });
+  }, "iframe-noload-allowfullscreen");
+</script>