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+++ b/dom/base/test/test_bug890580.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=890580
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 883129</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 with the flag OutputNonTextContentAsPlaceholder.
+    var encoder = Cc["@mozilla.org/layout/documentEncoder;1?type=text/plain"]
+                  .createInstance(de);
+    var flags = de.OutputRaw |
+                de.OutputNonTextContentAsPlaceholder;
+    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();
+    }
+
+    // The follows are test cases.
+    is(toPlaintext("case1"), "This is a button. Hello!", "test with <button>");
+    is(toPlaintext("case2"), "There is an\uFFFCimage.", "test with <img>");
+    is(toPlaintext("case3"), "\uFFFC with text.", "test with <input>");
+    is(toPlaintext("case4"), "There is an\uFFFCimage and a \uFFFC.",
+       "test with <img> and <input>");
+
+    SimpleTest.finish();
+  }
+
+  addLoadEvent(testPaintextSerializerWithPlaceHolder);
+  SimpleTest.waitForExplicitFinish();
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=890580">Mozilla Bug 890580</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <span id="case1"><button id="b">This is a button.</button> Hello!</span>
+  <span id="case2">There is an<img>image.</span>
+  <span id="case3"><input type="button" value="Input button"> with text.</span>
+  <span id="case4" contenteditable="true">There is an<img>image and
+  a <input type="button" value="button">.</span>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>