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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=895239
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 895239</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();
+    }
+
+    // Test cases to serialize all nodes including invisible nodes.
+    is(toPlaintext("case1"), "This is an audio \uFFFC! ", "test with <audio>");
+    is(toPlaintext("case2"), "This is a canvas \uFFFC! ", "test with <canvas>");
+    is(toPlaintext("case3"), "This is an iframe \uFFFC! ", "test with one <iframe>");
+    is(toPlaintext("case4"), "One iframe \uFFFC with another iframe \uFFFC. ", "test with two <iframes>");
+    is(toPlaintext("case5"), "This is a meter \uFFFC! ", "test with <meter>");
+    is(toPlaintext("case6"), "This is a progress \uFFFC! ", "test with <progress>");
+    is(toPlaintext("case7"), "This is an object \uFFFC! ", "test with <object>");
+    is(toPlaintext("case8"), "This is a svg \uFFFC! ", "test with <svg>");
+    is(toPlaintext("case9"), "This is a video \uFFFC! ", "test with <video>");
+    is(toPlaintext("case10"), "This is a video \uFFFC! ", "test with nested tags");
+
+    // Test cases to serialize visible nodes only.
+    encoder.init(document, "text/plain", flags | de.SkipInvisibleContent);
+    is(toPlaintext("case1"), "This is an audio \uFFFC! ", "test with <audio> for visible nodes");
+    is(toPlaintext("case2"), "This is a canvas \uFFFC! ", "test with <canvas> for visible nodes");
+    is(toPlaintext("case3"), "This is an iframe \uFFFC! ", "test with one <iframe> for visible nodes");
+    is(toPlaintext("case4"), "One iframe \uFFFC with another iframe . ", "test with two <iframes> for visible nodes");
+    is(toPlaintext("case5"), "This is a meter \uFFFC! ", "test with <meter> for visible nodes");
+    is(toPlaintext("case6"), "This is a progress \uFFFC! ", "test with <progress> for visible nodes");
+    is(toPlaintext("case7"), "This is an object \uFFFC! ", "test with <object> for visible nodes");
+    is(toPlaintext("case8"), "This is a svg \uFFFC! ", "test with <svg> for visible nodes");
+    is(toPlaintext("case9"), "This is a video \uFFFC! ", "test with <video> for visible nodes");
+    is(toPlaintext("case10"), "This is a video \uFFFC! ", "test with nested tags for visible nodes");
+    SimpleTest.finish();
+  }
+
+  addLoadEvent(testPaintextSerializerWithPlaceHolder);
+  SimpleTest.waitForExplicitFinish();
+  </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=895239">Mozilla Bug 895239</a>
+<p id="display"></p>
+<div id="content">
+  <span id="case1">This is an audio
+    <audio controls="controls">
+      Your browser does not support <code>audio</code> element.
+    </audio>!
+  </span>
+  <span id="case2">This is a canvas
+    <canvas height="100" width="100">
+      Your browser does not support canvas element.
+    </canvas>!
+  </span>
+  <span id="case3">This is an iframe
+    <iframe src="about:blank">
+      Your browser does not support iframes.
+    </iframe>!
+  </span>
+  <span id="case4">One iframe
+    <iframe src="about:blank">
+      Your browser does not support iframes.
+    </iframe> with another iframe
+    <iframe src="about:blank" style="display: none"></iframe>.
+  </span>
+  <span id="case5">This is a meter
+    <meter min="0" max="100" value="50">
+      50%
+    </meter>!
+  </span>
+  <span id="case6">This is a progress
+    <progress max="100" value="70">
+      70%
+    </progress>!
+  </span>
+  <span id="case7">This is an object
+    <object type="application/x-shockware-flash">
+      <a href="#">Download the plugin.</a>
+    </object>!
+  </span>
+  <span id="case8">This is a svg
+    <svg height="100" width="100">
+      Your browser does not support svg.
+      <circle cx="100" cy="100" r="80" fill="green"></circle>
+    </svg>!
+  </span>
+  <span id="case9">This is a video
+    <video>
+      Your browser does not support videos.
+    </video>!
+  </span>
+  <span id="case10">This is a video
+    <video>
+      Your browser does not support videos.<iframe src="about:blank"></iframe>
+    </video>!
+  </span>
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>