diff --git a/Base/res/html/tests/Attr-cloneNode.html b/Base/res/html/tests/Attr-cloneNode.html
new file mode 100644
index 00000000000..26d6de7ef7b
--- /dev/null
+++ b/Base/res/html/tests/Attr-cloneNode.html
@@ -0,0 +1,38 @@
+<html>
+<body>
+  <pre id="out"></pre>
+  <script>
+    function log(s) {
+      document.getElementById("out").innerHTML += s + "\n"
+    }
+
+    window.onload = function() {
+      let e = document.createElement("div")
+      e.setAttribute("foo", "bar")
+      let attr = e.getAttributeNode("foo")
+      let clone = attr.cloneNode()
+
+      function dumpAttr(name, attr) {
+        log(name + ": " + attr)
+        log(name + ".ownerElement: " + attr.ownerElement)
+        log(name + ".namespaceURI: " + attr.namespaceURI)
+        log(name + ".localName: " + attr.localName)
+        log(name + ".name: " + attr.name)
+        log(name + ".value: " + attr.value)
+        log(name + ".specified: " + attr.specified)
+        log("")
+      }
+
+      dumpAttr("attr", attr)
+      dumpAttr("clone", clone)
+
+      log("attr === clone -> " + (attr === clone))
+      log("attr.isEqualNode(clone) -> " + attr.isEqualNode(clone))
+
+      e.setAttribute("baz", "bux")
+      let other = e.getAttributeNode("baz")
+      log("attr.isEqualNode(other) -> " + attr.isEqualNode(other))
+    }
+  </script>
+</body>
+</html>
diff --git a/Base/res/html/tests/ProcessingInstruction-cloneNode.html b/Base/res/html/tests/ProcessingInstruction-cloneNode.html
new file mode 100644
index 00000000000..8fbb539ee8e
--- /dev/null
+++ b/Base/res/html/tests/ProcessingInstruction-cloneNode.html
@@ -0,0 +1,31 @@
+<html>
+<body>
+  <pre id="out"></pre>
+  <script>
+    function log(s) {
+      document.getElementById("out").innerHTML += s + "\n"
+    }
+
+    window.onload = function() {
+      let pi = document.createProcessingInstruction("someTarget", "someData")
+      let clone = pi.cloneNode()
+
+      function dumpProcessingInstruction(name, pi) {
+        log(name + ": " + pi)
+        log(name + ".target: " + pi.target)
+        log(name + ".data: " + pi.data)
+        log("")
+      }
+
+      dumpProcessingInstruction("pi", pi)
+      dumpProcessingInstruction("clone", clone)
+
+      log("pi === clone -> " + (pi === clone))
+      log("pi.isEqualNode(clone) -> " + pi.isEqualNode(clone))
+
+      let other = document.createProcessingInstruction("baz", "bux")
+      log("pi.isEqualNode(other) -> " + pi.isEqualNode(other))
+    }
+  </script>
+</body>
+</html>
