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diff --git a/editor/libeditor/tests/test_bug597331.html b/editor/libeditor/tests/test_bug597331.html
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+++ b/editor/libeditor/tests/test_bug597331.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=597331
+-->
+<head>
+  <title>Test for Bug 597331</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style>
+  textarea { border-color: white; }
+  </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=597331">Mozilla Bug 597331</a>
+<p id="display"></p>
+<div id="content">
+<textarea>line1
+line2
+line3
+</textarea>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 597331 **/
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  SimpleTest.executeSoon(function() {
+    var t = document.querySelector("textarea");
+    t.focus();
+    t.selectionStart = 4;
+    t.selectionEnd = 4;
+    SimpleTest.executeSoon(function() {
+      t.getBoundingClientRect(); // flush layout
+      var before = snapshotWindow(window, true);
+      t.selectionStart = 5;
+      t.selectionEnd = 5;
+      t.addEventListener("keydown", function() {
+        SimpleTest.executeSoon(function() {
+          t.style.display = "block";
+          document.body.offsetWidth;
+          t.style.display = "";
+          document.body.offsetWidth;
+
+          is(t.selectionStart, 4, "Cursor should be moved correctly");
+          is(t.selectionEnd, 4, "Cursor should be moved correctly");
+
+          var after = snapshotWindow(window, true);
+
+          var result = compareSnapshots(before, after, true);
+          var msg = "The caret should be displayed correctly after reframing";
+          if (!result[0]) {
+            msg += "\nRESULT:\n" + result[2];
+            msg += "\nREFERENCE:\n" + result[1];
+          }
+          ok(result[0], msg);
+
+          SimpleTest.finish();
+        });
+      }, {once: true});
+      synthesizeKey("KEY_ArrowLeft");
+    });
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>