react app

react-app/node_modules/react/lib/getActiveElement.js

@@ -0,0 +1,27 @@
+/**
+ * Copyright 2013-2015, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule getActiveElement
+ * @typechecks
+ */
+
+/**
+ * Same as document.activeElement but wraps in a try-catch block. In IE it is
+ * not safe to call document.activeElement if there is nothing focused.
+ *
+ * The activeElement will be null only if the document body is not yet defined.
+ */
+function getActiveElement() /*?DOMElement*/ {
+  try {
+    return document.activeElement || document.body;
+  } catch (e) {
+    return document.body;
+  }
+}
+
+module.exports = getActiveElement;