diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/cross-origin-to-whom-part-2.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/cross-origin-to-whom-part-2.window.js
new file mode 100644
index 0000000000000..5ff43a63f9423
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/cross-origin-to-whom-part-2.window.js
@@ -0,0 +1,59 @@
+async_test(t => {
+  const frame = document.body.appendChild(document.createElement("iframe"));
+  frame.src = "support/document-with-embedded-svg.html";
+  const elements = {
+    "embed": ["getSVGDocument"],
+    "frame": ["contentDocument"],
+    "iframe": ["getSVGDocument", "contentDocument"],
+    "object": ["getSVGDocument", "contentDocument"]
+  };
+  function element_to_document(element, api) {
+    return api === "getSVGDocument" ? element[api]() : element[api];
+  }
+  function assert_apis(instance, assertNull = false) {
+    const name = instance.localName;
+    let priorPossibleDocument = null;
+    elements[name].forEach(api => {
+      const assertReason = `${name}.${api}`;
+      const possibleDocument = element_to_document(instance, api);
+      if (assertNull) {
+        assert_equals(possibleDocument, null, assertReason);
+        return;
+      } else {
+        assert_not_equals(possibleDocument, null, assertReason);
+
+        
+        
+      }
+
+      
+      if (priorPossibleDocument === null) {
+        priorPossibleDocument = possibleDocument;
+      } else {
+        assert_equals(priorPossibleDocument, possibleDocument);
+      }
+    });
+  }
+  frame.onload = t.step_func_done(() => {
+    const instances = Object.keys(elements).map(element => frame.contentDocument.querySelector(element));
+    
+    instances.forEach(instance => assert_apis(instance));
+    
+    
+    instances.forEach(instance => {
+      const svgDocument = element_to_document(instance, elements[instance.localName][0]);
+      svgDocument.domain = svgDocument.domain;
+    });
+    instances.forEach(instance => assert_apis(instance, true));
+    const svgContainer = frame.contentDocument;
+    
+    
+    document.domain = document.domain;
+    assert_equals(frame.contentDocument, null);
+    instances.forEach(instance => assert_apis(instance, true));
+    
+    svgContainer.domain = svgContainer.domain;
+    instances.forEach(instance => assert_apis(instance));
+  });
+  document.body.appendChild(frame);
+}, "Test embed/frame/iframe/object nested document APIs for same origin-domain and cross origin-domain embedder document");
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/cross-origin-to-whom.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/cross-origin-to-whom.window.js
new file mode 100644
index 0000000000000..83e8254ddd187
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/cross-origin-to-whom.window.js
@@ -0,0 +1,37 @@
+async_test(t => {
+  const frame = document.body.appendChild(document.createElement("iframe"));
+  frame.src = "support/document-with-embedded-svg.html";
+  const elements = {
+    "embed": ["getSVGDocument"],
+    "frame": ["contentDocument"],
+    "iframe": ["getSVGDocument", "contentDocument"],
+    "object": ["getSVGDocument", "contentDocument"]
+  };
+  function assert_apis(instance) {
+    const name = instance.localName;
+    let priorPossibleDocument = null;
+    elements[name].forEach(api => {
+      const possibleDocument = api == "getSVGDocument" ? instance[api]() : instance[api];
+      assert_not_equals(possibleDocument, null, `${name}.${api}`);
+      
+      
+
+      
+      if (priorPossibleDocument === null) {
+        priorPossibleDocument = possibleDocument;
+      } else {
+        assert_equals(priorPossibleDocument, possibleDocument);
+      }
+    });
+  }
+  frame.onload = t.step_func_done(() => {
+    const instances = Object.keys(elements).map(element => frame.contentDocument.querySelector(element));
+    
+    instances.forEach(instance => assert_apis(instance));
+    
+    document.domain = document.domain;
+    assert_equals(frame.contentDocument, null);
+    instances.forEach(instance => assert_apis(instance));
+  });
+  document.body.appendChild(frame);
+}, "Test embed/frame/iframe/object nested document APIs for same origin-domain and cross origin-domain current settings object");
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/document-with-embedded-svg.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/document-with-embedded-svg.html
new file mode 100644
index 0000000000000..a81d13d9a8b63
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/document-with-embedded-svg.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<body>
+<script>
+["embed", "frame", "iframe", "object"].forEach(name => {
+  const frame = document.body.appendChild(document.createElement(name));
+  const attr = name !== "object" ? "src" : "data";
+  frame[attr] = "svg.svg";
+});
+</script>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/svg.svg b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/svg.svg
new file mode 100644
index 0000000000000..1570afcadc238
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/support/svg.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg"><rect height="100" width="100"/></svg>