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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=288789
+-->
+<head>
+  <title>Test for Bug 288789</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.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=288789">Mozilla Bug 288789</a>
+<p id="display"></p>
+<div id="content">
+<textarea id="ta" dir="rtl">
+
+&#x05d0;a&#x05d1;
+
+</textarea>
+<textarea id="tb">
+
+abc
+
+</textarea>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 288789 **/
+
+SimpleTest.waitForExplicitFinish();
+
+// This seems to be necessary because the selection is not set up properly otherwise
+setTimeout(test, 0);
+
+function test() {
+  var textarea = $("ta");
+
+  function collapse(offset) {
+	textarea.selectionStart = offset;
+  	textarea.selectionEnd = offset;
+  }
+
+  function testRight(offset) {
+    synthesizeKey("KEY_ArrowRight");
+    is(textarea.selectionStart, offset, "Right movement broken");
+  }
+
+  function testLeft(offset) {
+    synthesizeKey("KEY_ArrowLeft");
+    is(textarea.selectionStart, offset, "Left movement broken");
+  }
+
+  textarea.focus();
+  collapse(0);
+  ok(true, "Testing forward movement in RTL mode");
+  for (var i = 0; i < textarea.textContent.length; ++i) {
+    if (i == 0) {
+      testRight(i);
+    }
+    if (textarea.textContent[i] == 'a') {
+      testLeft(i);
+    } else {
+      testLeft(i + 1);
+    }
+    if (i == textarea.textContent.length - 1) {
+      testLeft(i + 1);
+    }
+  }
+  ok(true, "Testing backward movement in RTL mode");
+  for (var i = textarea.textContent.length; i > 0; --i) {
+    if (i == textarea.textContent.length) {
+      testLeft(i);
+    }
+    if (i > 0 && textarea.textContent[i - 1] == 'a') {
+      testRight(i);
+    } else {
+      testRight(i - 1);
+    }
+    if (i == 1) {
+      testRight(i - 1);
+    }
+  }
+
+  textarea = $("tb");
+  textarea.focus();
+  collapse(0);
+  ok(true, "Testing forward movement in LTR mode");
+  for (var i = 0; i < textarea.textContent.length; ++i) {
+    if (i == 0) {
+      testLeft(i);
+    }
+    testRight(i + 1);
+    if (i == textarea.textContent.length - 1) {
+      testRight(i + 1);
+    }
+  }
+  ok(true, "Testing backward movement in LTR mode");
+  for (var i = textarea.textContent.length; i > 0; --i) {
+    if (i == textarea.textContent.length) {
+      testRight(i);
+    }
+    testLeft(i - 1);
+    if (i == 1) {
+      testLeft(i - 1);
+    }
+  }
+
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+</body>
+</html>
+