diff --git a/tests/wpt/web-platform-tests/dom/nodes/Node-insertBefore.html b/tests/wpt/web-platform-tests/dom/nodes/Node-insertBefore.html
index 5e8581472c3..a9fc83b5009 100644
--- a/tests/wpt/web-platform-tests/dom/nodes/Node-insertBefore.html
+++ b/tests/wpt/web-platform-tests/dom/nodes/Node-insertBefore.html
@@ -298,9 +298,9 @@ test(function() {
   a.appendChild(b);
   a.appendChild(c);
   assert_array_equals(a.childNodes, [b, c]);
-  assert_equals(a.replaceChild(b, b), b);
+  assert_equals(a.insertBefore(b, b), b);
   assert_array_equals(a.childNodes, [b, c]);
-  assert_equals(a.replaceChild(c, c), c);
+  assert_equals(a.insertBefore(c, c), c);
   assert_array_equals(a.childNodes, [b, c]);
 }, "Inserting a node before itself should not move the node");
 </script>
diff --git a/tests/wpt/web-platform-tests/dom/nodes/Node-replaceChild.html b/tests/wpt/web-platform-tests/dom/nodes/Node-replaceChild.html
index d429750f76e..11e2764872d 100644
--- a/tests/wpt/web-platform-tests/dom/nodes/Node-replaceChild.html
+++ b/tests/wpt/web-platform-tests/dom/nodes/Node-replaceChild.html
@@ -265,6 +265,18 @@ test(function() {
   assert_equals(a.replaceChild(d, c), c);
   assert_array_equals(a.childNodes, [b, d, e]);
 }, "Replacing a node with its next sibling should work (4 children)");
+test(function() {
+  var a = document.createElement("div");
+  var b = document.createElement("div");
+  var c = document.createElement("div");
+  a.appendChild(b);
+  a.appendChild(c);
+  assert_array_equals(a.childNodes, [b, c]);
+  assert_equals(a.replaceChild(b, b), b);
+  assert_array_equals(a.childNodes, [b, c]);
+  assert_equals(a.replaceChild(c, c), c);
+  assert_array_equals(a.childNodes, [b, c]);
+}, "Replacing a node with itself should not move the node");
 
 // Step 7.
 test(function() {