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diff --git a/dom/inputmethod/mochitest/test_bug1026997.html b/dom/inputmethod/mochitest/test_bug1026997.html
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@@ -0,0 +1,101 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1026997
+-->
+<head>
+  <title>SelectionChange on InputMethod API.</title>
+  <script type="application/javascript;version=1.7" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript;version=1.7" src="inputmethod_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1026997">Mozilla Bug 1026997</a>
+<p id="display"></p>
+<pre id="test">
+<script class="testbody" type="application/javascript;version=1.7">
+
+inputmethod_setup(function() {
+  runTest();
+});
+
+// The frame script running in file_test_app.html.
+function appFrameScript() {
+  let input = content.document.getElementById('test-input');
+
+  input.focus();
+
+  function next(start, end) {
+    input.setSelectionRange(start, end);
+  }
+
+  addMessageListener("test:KeyBoard:nextSelection", function(event) {
+    let json = event.json;
+    next(json[0], json[1]);
+  });
+}
+
+function runTest() {
+  let actions = [
+    [0, 4],
+    [1, 1],
+    [3, 3],
+    [2, 3]
+  ];
+
+  let counter = 0;
+  let mm = null;
+  let ic = null;
+
+  let im = navigator.mozInputMethod;
+  im.oninputcontextchange = function() {
+    ok(true, 'inputcontextchange event was fired.');
+    im.oninputcontextchange = null;
+
+    ic = im.inputcontext;
+    if (!ic) {
+      ok(false, 'Should have a non-null inputcontext.');
+      inputmethod_cleanup();
+      return;
+    }
+
+    ic.onselectionchange = function() {
+      is(ic.selectionStart, actions[counter][0], "start");
+      is(ic.selectionEnd, actions[counter][1], "end");
+
+      if (++counter === actions.length) {
+        inputmethod_cleanup();
+        return;
+      }
+
+      next();
+    };
+
+    next();
+  };
+
+  // Set current page as an input method.
+  SpecialPowers.wrap(im).setActive(true);
+
+  // Create an app frame to recieve keyboard inputs.
+  let app = document.createElement('iframe');
+  app.src = 'file_test_app.html';
+  app.setAttribute('mozbrowser', true);
+  document.body.appendChild(app);
+  app.addEventListener('mozbrowserloadend', function() {
+    mm = SpecialPowers.getBrowserFrameMessageManager(app);
+    mm.loadFrameScript('data:,(' + appFrameScript.toString() + ')();', false);
+    next();
+  });
+
+  function next() {
+    if (ic && mm) {
+      mm.sendAsyncMessage('test:KeyBoard:nextSelection', actions[counter]);
+    }
+  }
+}
+</script>
+</pre>
+</body>
+</html>
+