diff --git a/application/common/manifest_unittest.cc b/application/common/manifest_unittest.cc
index 04637498f9..f4f833507b 100644
--- a/application/common/manifest_unittest.cc
+++ b/application/common/manifest_unittest.cc
@@ -100,10 +100,10 @@ TEST_F(ManifestTest, ApplicationTypes) {
 
   // Platform app.
   MutateManifest(
-      &manifest, keys::kPlatformAppBackgroundKey, new base::DictionaryValue());
+      &manifest, keys::kAppMainKey, new base::DictionaryValue());
   AssertType(manifest.get(), Manifest::TYPE_PACKAGED_APP);
   MutateManifest(
-      &manifest, keys::kPlatformAppBackgroundKey, NULL);
+      &manifest, keys::kAppMainKey, NULL);
 
   // Hosted app.
   MutateManifest(
diff --git a/application/test/application_main_document_browsertest.cc b/application/test/application_main_document_browsertest.cc
new file mode 100644
index 0000000000..1fd5f4f9de
--- /dev/null
+++ b/application/test/application_main_document_browsertest.cc
@@ -0,0 +1,89 @@
+// Copyright (c) 2013 Intel Corporation. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+#include "base/strings/utf_string_conversions.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/test_utils.h"
+#include "net/base/net_util.h"
+#include "xwalk/application/browser/application_system.h"
+#include "xwalk/application/common/application.h"
+#include "xwalk/application/common/constants.h"
+#include "xwalk/runtime/browser/runtime.h"
+#include "xwalk/runtime/browser/runtime_registry.h"
+#include "xwalk/runtime/common/xwalk_notification_types.h"
+#include "xwalk/test/base/in_process_browser_test.h"
+
+namespace {
+
+bool WaitForRuntimeCountCallback(int* count) {
+  --(*count);
+  return *count == 0;
+}
+
+}  // namespace
+
+using xwalk::application::Application;
+using xwalk::Runtime;
+using xwalk::RuntimeRegistry;
+
+class ApplicationMainDocumentBrowserTest: public InProcessBrowserTest {
+ public:
+  virtual void SetUp() OVERRIDE;
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
+
+  base::FilePath test_data_dir_;
+};
+
+void ApplicationMainDocumentBrowserTest::SetUp() {
+  PathService::Get(base::DIR_SOURCE_ROOT, &test_data_dir_);
+  test_data_dir_ = test_data_dir_
+    .Append(FILE_PATH_LITERAL("xwalk"))
+    .Append(FILE_PATH_LITERAL("application"))
+    .Append(FILE_PATH_LITERAL("test"))
+    .Append(FILE_PATH_LITERAL("data"));
+  InProcessBrowserTest::SetUp();
+}
+
+void ApplicationMainDocumentBrowserTest::SetUpCommandLine(
+    CommandLine* command_line) {
+  GURL url = net::FilePathToFileURL(test_data_dir_.Append(
+        FILE_PATH_LITERAL("main_document")));
+  command_line->AppendArg(url.spec());
+}
+
+// Verifies the runtime creation when main document is used.
+IN_PROC_BROWSER_TEST_F(ApplicationMainDocumentBrowserTest, MainDocument) {
+  content::RunAllPendingInMessageLoop();
+  const xwalk::RuntimeList& runtimes = RuntimeRegistry::Get()->runtimes();
+  // At least the main document's runtime exist after launch.
+  ASSERT_GE(runtimes.size(), 1);
+
+  Runtime* main_runtime = runtimes[0];
+  xwalk::RuntimeContext* runtime_context = main_runtime->runtime_context();
+  xwalk::application::ApplicationService* service =
+    runtime_context->GetApplicationSystem()->application_service();
+  const Application* app = service->GetRunningApplication();
+  GURL generated_url =
+    app->GetResourceURL(xwalk::application::kGeneratedMainDocumentFilename);
+  // Check main document URL.
+  ASSERT_EQ(main_runtime->web_contents()->GetURL(), generated_url);
+  ASSERT_TRUE(!main_runtime->window());
+
+  // There should exist 2 runtimes(one for generated main document, one for the
+  // window created by main document). As WindowedNotificationObserver::Wait()
+  // will call the callback function once when inovke, so add one more for the
+  // Wait() to consume.
+  int count = 2 - runtimes.size() + 1;
+  if (count > 1) {
+    content::WindowedNotificationObserver(
+        xwalk::NOTIFICATION_RUNTIME_OPENED,
+        base::Bind(&WaitForRuntimeCountCallback, &count)).Wait();
+  }
+
+  ASSERT_EQ(2, RuntimeRegistry::Get()->runtimes().size());
+}
diff --git a/application/test/data/main_document/main.html b/application/test/data/main_document/main.html
new file mode 100644
index 0000000000..9b4ef8ad5f
--- /dev/null
+++ b/application/test/data/main_document/main.html
@@ -0,0 +1,5 @@
+<html>
+  <body>
+    <h1> hello </h1>
+  </body>
+</html>
diff --git a/application/test/data/main_document/main.js b/application/test/data/main_document/main.js
new file mode 100644
index 0000000000..1c81d3ba5d
--- /dev/null
+++ b/application/test/data/main_document/main.js
@@ -0,0 +1,4 @@
+setTimeout(
+  function(){
+    window.open("main.html");
+  }, 100);
diff --git a/application/test/data/main_document/manifest.json b/application/test/data/main_document/manifest.json
new file mode 100644
index 0000000000..12d55c995c
--- /dev/null
+++ b/application/test/data/main_document/manifest.json
@@ -0,0 +1,10 @@
+{
+  "name": "main_document_test",
+  "manifest_version": 1,
+  "version": "1.0",
+  "app": {
+    "main": {
+      "scripts": ["main.js"]
+    }
+  }
+}
diff --git a/xwalk_tests.gypi b/xwalk_tests.gypi
index e04b1ca1ba..92fe2943a8 100644
--- a/xwalk_tests.gypi
+++ b/xwalk_tests.gypi
@@ -107,6 +107,7 @@
       'HAS_OUT_OF_PROC_TEST_RUNNER',
     ],
     'sources': [
+      'application/test/application_main_document_browsertest.cc',
       'runtime/browser/xwalk_download_browsertest.cc',
       'runtime/browser/xwalk_form_input_browsertest.cc',
       'runtime/browser/xwalk_runtime_browsertest.cc',