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diff --git a/editor/libeditor/tests/test_bug1385905.html b/editor/libeditor/tests/test_bug1385905.html
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+++ b/editor/libeditor/tests/test_bug1385905.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi=id=1385905
+-->
+<html>
+<head>
+  <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=1385905">Mozilla Bug 1385905</a>
+<div id="display"></div>
+<div id="editor" contenteditable style="padding: 5px;"><div>contents</div></div>
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(() => {
+  function ensureNoPaddingBR() {
+    for (let br of document.querySelectorAll("#editor > div > br")) {
+      ok(!SpecialPowers.wrap(br).isPaddingForEmptyLastLine,
+         "padding <br> element shouldn't be used with this test");
+    }
+  }
+  document.execCommand("defaultparagraphseparator", false, "div");
+  var editor = document.getElementById("editor");
+  // Click the left blank area of the first line to set cursor to the start of "contents".
+  synthesizeMouse(editor, 3, 10, {});
+  synthesizeKey("KEY_Enter");
+  is(editor.innerHTML, "<div><br></div><div>contents</div>",
+     "Typing Enter at start of the <div> element should split the <div> element");
+  synthesizeKey("KEY_ArrowUp");
+  sendString("x");
+  is(editor.innerHTML, "<div>x<br></div><div>contents</div>",
+     "Typing 'x' at the empty <div> element should just insert 'x' into the <div> element");
+  ensureNoPaddingBR();
+  synthesizeKey("KEY_Enter");
+  is(editor.innerHTML, "<div>x</div><div><br></div><div>contents</div>",
+     "Typing Enter next to 'x' in the first <div> element should split the <div> element and inserts <br> element to a new <div> element");
+  ensureNoPaddingBR();
+  synthesizeKey("KEY_Enter");
+  is(editor.innerHTML, "<div>x</div><div><br></div><div><br></div><div>contents</div>",
+     "Typing Enter in the empty <div> should split the <div> element and inserts <br> element to a new <div> element");
+  ensureNoPaddingBR();
+  SimpleTest.finish();
+});
+</script>
+</body>
+</html>