diff --git a/core/includes/common.inc b/core/includes/common.inc
index 4229d52..ea3f21c 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3995,6 +3995,7 @@ function drupal_add_js($data = NULL, $options = NULL) {
       // Register all required libraries.
       drupal_add_library('system', 'jquery', TRUE);
       drupal_add_library('system', 'jquery.once', TRUE);
+      drupal_add_library('system', 'html5shim', TRUE);
     }
 
     switch ($options['type']) {
diff --git a/core/modules/simpletest/tests/common.test b/core/modules/simpletest/tests/common.test
index c9640ba..6411592 100644
--- a/core/modules/simpletest/tests/common.test
+++ b/core/modules/simpletest/tests/common.test
@@ -1191,6 +1191,7 @@ class JavaScriptTestCase extends DrupalWebTestCase {
     $javascript = drupal_add_js('core/misc/collapse.js');
     $this->assertTrue(array_key_exists('core/misc/jquery.js', $javascript), t('jQuery is added when a file is added.'));
     $this->assertTrue(array_key_exists('core/misc/drupal.js', $javascript), t('Drupal.js is added when file is added.'));
+    $this->assertTrue(array_key_exists('core/misc/html5.js', $javascript), t('html5.js is added when file is added.'));
     $this->assertTrue(array_key_exists('core/misc/collapse.js', $javascript), t('JavaScript files are correctly added.'));
     $this->assertEqual(base_path(), $javascript['settings']['data'][0]['basePath'], t('Base path JavaScript setting is correctly set.'));
     url('', array('prefix' => &$prefix));
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 27e20b5..83de781 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -1240,6 +1240,20 @@ function system_library_info() {
     ),
   );
 
+  // html5shim.
+  $libraries['html5shim'] = array(
+    'title' => 'html5shim',
+    'website' => 'http://html5shim.googlecode.com/svn/trunk/html5.js',
+    'version' => '1.0',
+    'js' => array(
+      'core/misc/html5.js' => array(
+        'group' => JS_LIBRARY,
+        'weight' => -21,
+        'browsers' => array('IE' => 'lte IE 8', '!IE' => FALSE,),
+      ),
+    ),
+  );
+
   // Cookie.
   $libraries['jquery.cookie'] = array(
     'title' => 'Cookie',