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diff --git a/javascript/videojs/src/js/utils/dom-data.js b/javascript/videojs/src/js/utils/dom-data.js
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+++ b/javascript/videojs/src/js/utils/dom-data.js
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+/**
+ * @file dom-data.js
+ * @module dom-data
+ */
+
+/**
+ * Element Data Store.
+ *
+ * Allows for binding data to an element without putting it directly on the
+ * element. Ex. Event listeners are stored here.
+ * (also from jsninja.com, slightly modified and updated for closure compiler)
+ *
+ * @type {Object}
+ * @private
+ */
+export default new WeakMap();