code: function AbstractMediaLoader(loadItem, preferXHR, type) {
  		this.AbstractLoader_constructor(loadItem, preferXHR, type);
  
  		// public properties
  		this.resultFormatter = this._formatResult;
  
  		// protected properties
  		this._tagSrcAttribute = "src";
  
          this.on("initialize", this._updateXHR, this);
  	}
docs: constructor 
  The AbstractMediaLoader is a base class that handles some of the shared methods and properties of loaders that
  handle HTML media elements, such as Video and Audio.
  @class AbstractMediaLoader
  @param {LoadItem|Object} loadItem
  @param {Boolean} preferXHR
  @param {String} type The type of media to load. Usually "video" or "audio".
  @extends AbstractLoader
  @constructor