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diff --git a/testing/web-platform/tests/editing/other/undo-insertparagraph-after-moving-split-nodes.html b/testing/web-platform/tests/editing/other/undo-insertparagraph-after-moving-split-nodes.html
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+++ b/testing/web-platform/tests/editing/other/undo-insertparagraph-after-moving-split-nodes.html
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+<!doctype html>
+<html>
+<head>
+<meta charset="utf-8">
+<meta name="timeout" content="long">
+<title>Undo after splitting nodes are moved</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="../include/editor-test-utils.js"></script>
+</head>
+<body>
+<div contenteditable></div>
+<script>
+"use strict";
+
+document.execCommand("defaultParagraphSeparator", false, "div");
+const utils =
+  new EditorTestUtils(document.querySelector("div[contenteditable]"));
+
+promise_test(async t => {
+  utils.setupEditingHost(
+    `<div>abc[]def</div><p>ghi</p>`
+  );
+  await utils.sendEnterKey();
+  const right = utils.editingHost.querySelector("div + div");
+  utils.editingHost.appendChild(right);
+  // Now, the right <div> is after the <p>, it should be merged into the left
+  // <div> before the <p>.
+  document.execCommand("undo");
+  assert_in_array(
+    utils.editingHost.innerHTML,
+    [
+      "<div>abcdef</div><p>ghi</p>",
+      "<div>abcdef<br></div><p>ghi</p>",
+    ]
+  );
+}, "Undo insertParagraph after moving right node to different paragraph");
+
+promise_test(async () => {
+  utils.setupEditingHost(
+    `<p>abc</p><div>def[]ghi</div>`
+  );
+  await utils.sendEnterKey();
+  const left = utils.editingHost.querySelector("div");
+  utils.editingHost.insertBefore(left, document.querySelector("p"));
+  // Now, the left <div> is before the <p>, the right <div> after the <p> should
+  // be merged into it.
+  document.execCommand("undo");
+  assert_in_array(
+    utils.editingHost.innerHTML,
+    [
+      "<div>defghi</div><p>abc</p>",
+      "<div>defghi<br></div><p>abc</p>",
+    ]
+  );
+}, "Undo insertParagraph after moving left node to different paragraph");
+
+promise_test(async () => {
+  utils.setupEditingHost(
+    `<div>abc[]def</div>`
+  );
+  await utils.sendEnterKey();
+  const left = utils.editingHost.querySelector("div");
+  const right = utils.editingHost.querySelector("div + div");
+  left.insertBefore(right, left.firstChild);
+  // Now, the right <div> is a child node of the left <div>.  Its children
+  // should be merged to the parent.
+  document.execCommand("undo");
+  assert_in_array(
+    utils.editingHost.innerHTML,
+    [
+      "<div>abcdef</div>",
+      "<div>abcdef<br></div>",
+    ]
+  );
+}, "Undo insertParagraph after moving right node into the left node");
+
+promise_test(async () => {
+  utils.setupEditingHost(
+    `<div>abc[]def</div>`
+  );
+  await utils.sendEnterKey();
+  const left = utils.editingHost.querySelector("div");
+  const right = utils.editingHost.querySelector("div + div");
+  right.appendChild(left);
+  // Now, the right <div> is parent of the left <div>.  The children of the
+  // right <div> should be moved to the child left <div>, but the right <div>
+  // should be removed.
+  document.execCommand("undo");
+  assert_equals(
+    utils.editingHost.innerHTML,
+    "",
+    "The right <div> containing the left <div> should be removed"
+  );
+  assert_in_array(
+    left.innerHTML,
+    [
+      "abcdef",
+      "abcdef<br>",
+    ],
+    "The left <div> which was disconnected should have the original content"
+  );
+}, "Undo insertParagraph after moving left node into the right node");
+</script>
+</body>
+</html>