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diff --git a/editor/libeditor/tests/test_bug600570.html b/editor/libeditor/tests/test_bug600570.html
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+++ b/editor/libeditor/tests/test_bug600570.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=600570
+-->
+<head>
+  <title>Test for Bug 600570</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/WindowSnapshot.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=600570">Mozilla Bug 600570</a>
+<p id="display"></p>
+<div id="content">
+<textarea spellcheck="false">
+aaa
+[bbb]</textarea>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 600570 **/
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  var t = document.querySelector("textarea");
+  t.value = "[aaa\nbbb]";
+  t.focus();
+  synthesizeKey("A", {accelKey: true});
+
+  SimpleTest.executeSoon(function() {
+    t.getBoundingClientRect(); // flush layout
+    var afterSetValue = snapshotWindow(window);
+
+    t.value = t.defaultValue;
+
+    t.selectionStart = 0;
+    t.selectionEnd = 4;
+    SimpleTest.waitForClipboard("aaa\n",
+      function() {
+        synthesizeKey("X", {accelKey: true});
+      },
+      function() {
+        t.addEventListener("input", function() {
+          t.removeEventListener("input", arguments.callee, false);
+
+          setTimeout(function() { // Avoid the assertion in bug 649797
+            is(t.value, "[aaa\nbbb]", "The value of the textarea should be correct");
+            synthesizeKey("A", {accelKey: true});
+            is(t.selectionStart, 0, "Select all should set the selection start to the beginning of textarea");
+            is(t.selectionEnd, 9, "Select all should set the selection end to the end of textarea");
+
+            var afterPaste = snapshotWindow(window);
+
+            var res = compareSnapshots(afterSetValue, afterPaste, true);
+            var msg = "Pasting and setting the value directly should result in the same rendering";
+            if (!res[0]) {
+              msg += "\nRESULT:\n" + res[2] + "\nREFERENCE:\n" + res[1];
+            }
+            ok(res[0], msg);
+
+            SimpleTest.finish();
+          }, 0);
+        }, false);
+        synthesizeKey("VK_RIGHT", {});
+        synthesizeKey("V", {accelKey: true});
+      },
+      function() {
+        SimpleTest.finish();
+      }
+    );
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>