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diff --git a/dom/base/test/test_bug902847.html b/dom/base/test/test_bug902847.html
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+++ b/dom/base/test/test_bug902847.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=902847
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 902847</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript">
+  function testPaintextSerializerWithPlaceHolder() {
+
+    const de = SpecialPowers.Ci.nsIDocumentEncoder;
+    const Cc = SpecialPowers.Cc;
+
+    // Create a plaintext encoder.
+    var encoder = Cc["@mozilla.org/layout/documentEncoder;1?type=text/plain"]
+                  .createInstance(de);
+    var flags = de.OutputRaw |
+                de.OutputLFLineBreak |
+                de.OutputDontRemoveLineEndingSpaces;
+    encoder.init(document, "text/plain", flags);
+
+    function toPlaintext(id) {
+      var element = document.getElementById(id);
+      var range = document.createRange();
+      range.selectNodeContents(element);
+      encoder.setRange(range);
+      return encoder.encodeToString().replace(/\n/g, '\\n')
+                                     .replace(/\r/g, '\\r');
+    }
+
+    // Test cases.
+    is(toPlaintext("case1"), "Hello \\nboy!", "Case 1 failed.");
+    is(toPlaintext("case2"), "Hello \\nboy!", "Case 2 failed.");
+    is(toPlaintext("case3"), "Hello \\nboy!", "Case 3 failed.");
+    is(toPlaintext("case4"), "Hello  \\nboy!", "Case 4 failed.");
+    SimpleTest.finish();
+  }
+
+  addLoadEvent(testPaintextSerializerWithPlaceHolder);
+  SimpleTest.waitForExplicitFinish();
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=902847">Mozilla Bug 902847</a>
+<p id="display"></p>
+<div id="content">
+  <p id="case1">Hello <br>boy!</p>
+  <p id="case2">Hello  <br>boy!</p>
+  <p id="case3">Hello&nbsp;<br>boy!</p>
+  <p id="case4">Hello&nbsp;&nbsp;<br>boy!</p>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>