code: function MediaTagRequest(loadItem, tag, srcAttribute) {
  		this.AbstractRequest_constructor(loadItem);
  
  		// protected properties
  		this._tag = tag;
  		this._tagSrcAttribute = srcAttribute;
  		this._loadedHandler = createjs.proxy(this._handleTagComplete, this);
  	}
docs: constructor 
  An {{#crossLink "TagRequest"}}{{/crossLink}} that loads HTML tags for video and audio.
  @class MediaTagRequest
  @param {LoadItem} loadItem
  @param {HTMLAudioElement|HTMLVideoElement} tag
  @param {String} srcAttribute The tag attribute that specifies the source, such as "src", "href", etc.
  @constructor