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+++ b/embedding/test/test_bug293834.html
@@ -0,0 +1,137 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=293834
+-->
+<head>
+  <title>Test for Bug 293834</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.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=293834">Mozilla Bug 293834</a>
+<p id="display">
+
+</p>
+<pre id="results"></pre>
+<div id="content" style="display: none">
+    <iframe src="bug293834_form.html" id="source"></iframe>
+    <br>
+    <iframe id="dest"></iframe>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+/** Test for Bug 293834 **/
+
+var textareas = ["a-textbox", "a-prefilled-textbox"];
+var textboxes = ["a-text", "a-prefilled-text"];
+
+function fillform(doc) {
+    for (var i in textareas) {
+        doc.getElementById(textareas[i]).textContent += "form state";
+    }
+    for (var i in textboxes) {
+        doc.getElementById(textboxes[i]).value += "form state";
+    }
+    doc.getElementById('a-checkbox').checked = true;
+    doc.getElementById("radioa").checked = true;
+    doc.getElementById("aselect").selectedIndex = 0;
+}
+
+function checkform(doc) {
+    for (var i in textareas) {
+        var textContent = doc.getElementById(textareas[i]).textContent;
+        ok(/form\s+state/m.test(textContent),
+            "Modified textarea "+textareas[i]+" form state not preserved!");
+    }
+    for (var i in textboxes) {
+        var value = doc.getElementById(textboxes[i]).value;
+        ok(/form\s+state/m.test(value),
+            "Modified textbox "+textboxes[i]+" form state not preserved!");
+    }
+    ok(doc.getElementById('a-checkbox').checked,
+        "Modified checkbox checked state not preserved!");
+    ok(doc.getElementById("radioa").checked,
+        "Modified radio checked state not preserved!");
+    ok(doc.getElementById("aselect").selectedIndex == 0,
+        "Modified select selected index not preserved");
+}
+
+const Cc = SpecialPowers.Cc;
+const Ci = SpecialPowers.Ci;
+
+function getTempDir() {
+    return Cc["@mozilla.org/file/directory_service;1"]
+            .getService(Ci.nsIProperties)
+            .get("TmpD", Ci.nsILocalFile);
+}
+
+function getFileContents(aFile) {
+    const PR_RDONLY = 0x01;
+    var fileStream = Cc["@mozilla.org/network/file-input-stream;1"]
+                        .createInstance(Ci.nsIFileInputStream);
+    fileStream.init(aFile, PR_RDONLY, 0400,
+                    Ci.nsIFileInputStream.DELETE_ON_CLOSE
+                  | Ci.nsIFileInputStream.CLOSE_ON_EOF);
+    var inputStream = Cc["@mozilla.org/scriptableinputstream;1"]
+                        .createInstance(Ci.nsIScriptableInputStream);
+    inputStream.init(fileStream);
+    var data = "";
+    do {
+        var str = inputStream.read(inputStream.available());
+        data += str;
+    } while(str.length > 0);
+
+    return data;
+}
+
+function persistDocument(aDoc) {
+    const nsIWBP = Ci.nsIWebBrowserPersist;
+    const persistFlags =
+                  nsIWBP.PERSIST_FLAGS_REPLACE_EXISTING_FILES
+                | nsIWBP.PERSIST_FLAGS_FROM_CACHE
+                | nsIWBP.PERSIST_FLAGS_AUTODETECT_APPLY_CONVERSION
+    const encodingFlags =
+                  nsIWBP.ENCODE_FLAGS_ENCODE_BASIC_ENTITIES;
+
+    var ioService = Cc["@mozilla.org/network/io-service;1"]
+                    .getService(Ci.nsIIOService);
+
+
+    var file = getTempDir();
+    file.append("bug293834-serialized.html");
+
+    var persist = Cc["@mozilla.org/embedding/browser/nsWebBrowserPersist;1"]
+                    .createInstance(Ci.nsIWebBrowserPersist);
+    persist.progressListener = null;
+    persist.persistFlags = persistFlags;
+    const kWrapColumn = 80;
+    var folder = getTempDir();
+    folder.append("bug293834-serialized");
+    persist.saveDocument(aDoc, ioService.newFileURI(file),
+                         folder,
+                         aDoc.contentType,
+                         encodingFlags, kWrapColumn);
+    return getFileContents(file);
+}
+
+SimpleTest.waitForExplicitFinish();
+
+addLoadEvent(function() {
+    var srcDoc = document.getElementById('source').contentDocument;
+    fillform(srcDoc);
+    checkform(srcDoc);
+    var serializedString = persistDocument(srcDoc);
+
+    // We can't access file:/// URLs directly for security reasons,
+    // so we have to parse the serialized content string indirectly
+    var targetDoc = document.getElementById('dest').contentDocument;
+    targetDoc.write(serializedString);
+
+    checkform(targetDoc);
+    SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>