node_modules

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diff --git a/node_modules/fbjs/lib/getDocumentScrollElement.js b/node_modules/fbjs/lib/getDocumentScrollElement.js
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index 000000000..cf40511b0
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+++ b/node_modules/fbjs/lib/getDocumentScrollElement.js
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+/**
+ * Copyright (c) 2013-present, 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.
+ *
+ * @typechecks
+ */
+
+'use strict';
+
+var isWebkit = typeof navigator !== 'undefined' && navigator.userAgent.indexOf('AppleWebKit') > -1;
+
+/**
+ * Gets the element with the document scroll properties such as `scrollLeft` and
+ * `scrollHeight`. This may differ across different browsers.
+ *
+ * NOTE: The return value can be null if the DOM is not yet ready.
+ *
+ * @param {?DOMDocument} doc Defaults to current document.
+ * @return {?DOMElement}
+ */
+function getDocumentScrollElement(doc) {
+  doc = doc || document;
+  return !isWebkit && doc.compatMode === 'CSS1Compat' ? doc.documentElement : doc.body;
+}
+
+module.exports = getDocumentScrollElement;
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