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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=449243
+-->
+<head>
+  <title>Test for Bug 449243</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=449243">Mozilla Bug 449243</a>
+<p id="display"></p>
+<div id="content" contenteditable>
+  <h2>This is a title</h2>
+  <ul>
+    <li>this is a</li>
+    <li>bullet list</li>
+  </ul>
+  <ol>
+    <li>this is a</li>
+    <li>numbered list</li>
+  </ol>
+</div>
+
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 449243 **/
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(runTests);
+
+const CARET_BEGIN  = 0;
+const CARET_MIDDLE = 1;
+const CARET_END    = 2;
+
+function split(element, caretPos, nbKeyPresses) {
+  // put the caret on the requested position
+  const offset = (() => {
+    switch (caretPos) {
+      case CARET_BEGIN:
+        return 0;
+      case CARET_MIDDLE:
+        return Math.floor(element.textContent.length / 2);
+      case CARET_END:
+        return element.textContent.length;
+    }
+    return 0;
+  })();
+  getSelection().collapse(element.firstChild, offset);
+
+  // simulates a [Return] keypress
+  for (let i = 0; i < nbKeyPresses; i++) {
+    synthesizeKey("KEY_Enter");
+  }
+}
+
+function undo(nbKeyPresses) {
+  for (let i = 0; i < nbKeyPresses; i++) {
+    document.execCommand("Undo");
+  }
+}
+
+function getNewElement(element) {
+  return element.nextElementSibling;
+}
+
+function runTests() {
+  const content = document.querySelector("[contenteditable]");
+  const header = content.querySelector("h2");
+  const ulItem = content.querySelector("ul > li:last-child");
+  const olItem = content.querySelector("ol > li:last-child");
+  content.focus();
+
+  // beginning of selection: split current node
+  split(header, CARET_BEGIN, 1);
+  is(
+    getNewElement(header)?.nodeName,
+    header.nodeName,
+    "Pressing [Return] at the beginning of a header " +
+    "should create another header."
+  );
+  split(ulItem, CARET_BEGIN, 2);
+  is(
+    getNewElement(ulItem)?.nodeName,
+    ulItem.nodeName,
+    "Pressing [Return] at the beginning of an unordered list item " +
+    "should create another list item."
+  );
+  split(olItem, CARET_BEGIN, 2);
+  is(
+    getNewElement(olItem)?.nodeName,
+    olItem.nodeName,
+    "Pressing [Return] at the beginning of an ordered list item " +
+    "should create another list item."
+  );
+  undo(3);
+
+  // middle of selection: split current node
+  split(header, CARET_MIDDLE, 1);
+  is(
+    getNewElement(header)?.nodeName,
+    header.nodeName,
+    "Pressing [Return] at the middle of a header " +
+    "should create another header."
+  );
+  split(ulItem, CARET_MIDDLE, 2);
+  is(
+    getNewElement(ulItem)?.nodeName,
+    ulItem.nodeName,
+    "Pressing [Return] at the middle of an unordered list item " +
+    "should create another list item."
+  );
+  split(olItem, CARET_MIDDLE, 2);
+  is(
+    getNewElement(olItem)?.nodeName,
+    olItem.nodeName,
+    "Pressing [Return] at the middle of an ordered list item " +
+    "should create another list item."
+  );
+  undo(3);
+
+  // end of selection: create a new div/paragraph
+  function testEndOfSelection(expected, defaultParagraphSeparator) {
+    split(header, CARET_END, 1);
+    is(
+      content.querySelector("h2+*")?.nodeName,
+      expected.toUpperCase(),
+      `Pressing [Return] at the end of a header should create a new <${
+        expected
+      }> (defaultParagraphSeparator: <${defaultParagraphSeparator}>)`
+    );
+    split(ulItem, CARET_END, 2);
+    is(
+      content.querySelector("ul+*")?.nodeName,
+      expected.toUpperCase(),
+      `Pressing [Return] twice at the end of an unordered list item should create a new <${
+        expected
+      }> (defaultParagraphSeparator: <${defaultParagraphSeparator}>)`
+    );
+    split(olItem, CARET_END, 2);
+    is(
+      content.querySelector("ol+*")?.nodeName,
+      expected.toUpperCase(),
+      `Pressing [Return] twice at the end of an ordered list item should create a new <${
+        expected
+      }> (defaultParagraphSeparator: <${defaultParagraphSeparator}>)`
+    );
+    undo(3);
+  }
+
+  document.execCommand("defaultParagraphSeparator", false, "div");
+  testEndOfSelection("div", "div");
+  document.execCommand("defaultParagraphSeparator", false, "p");
+  testEndOfSelection("p", "p");
+  document.execCommand("defaultParagraphSeparator", false, "br");
+  testEndOfSelection("p", "br");
+
+  // done
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+</body>
+</html>