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diff --git a/dom/html/test/test_bug347174_write.html b/dom/html/test/test_bug347174_write.html
new file mode 100644
index 0000000000..75912b59a9
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+++ b/dom/html/test/test_bug347174_write.html
@@ -0,0 +1,71 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=347174
+-->
+<head>
+  <title>Test for Bug 347174</title>
+  <script 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=347174">Mozilla Bug 347174</a>
+<p id="display"></p>
+
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 347174 **/
+// simple test of readyState during loading, DOMContentLoaded, and complete
+// this test passes in IE7
+window.readyStateText = [];
+window.loaded = false;
+function attachCustomEventListener(element, eventName, command) {
+    if (window.addEventListener && !window.opera)
+        element.addEventListener(eventName, command, true);
+    else if (window.attachEvent)
+        element.attachEvent("on" + eventName, command);
+}
+
+function showMessage(msg) {
+    window.readyStateText.push(msg);
+    document.getElementById("display").innerHTML = readyStateText.join("<br>");
+}
+
+function frameLoad() {
+  var doc = $('iframe').contentWindow.document;
+  is(doc.readyState, "complete", "frame document.readyState should be 'complete' on load");
+  showMessage("frame load: " + doc.readyState);
+  if (window.loaded) SimpleTest.finish();
+}
+
+function load() {
+    window.loaded = true;
+
+    var imgsrc = "<img onload ='window.parent.imgLoad()' src='image.png?noCache="
+               + (new Date().getTime()) + "'>\n";
+    var doc = $('iframe').contentWindow.document;
+    doc.writeln(imgsrc);
+    doc.close();
+    showMessage("frame after document.write: " + doc.readyState);
+    isnot(doc.readyState, "complete", "frame document.readyState should not be 'complete' after document.write");
+}
+
+function imgLoad() {
+    var doc = $('iframe').contentWindow.document;
+    showMessage("frame after imgLoad: " + doc.readyState);
+    is(doc.readyState, "interactive", "frame document.readyState should still be 'interactive' after img loads");
+}
+
+window.onload=load;
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+<iframe src="404doesnotexist" id="iframe" onload="frameLoad();"></iframe>
+</body>
+</html>