code: function( indexA, indexB ) {
  		// We need the following check due to a Firefox bug
  		// https://bugzilla.mozilla.org/show_bug.cgi?id=458886
  		if ( typeof indexB != 'number' )
  			return this.$.nodeValue.substr( indexA );
  		else
  			return this.$.nodeValue.substring( indexA, indexB );
  	}
docs: Extracts characters from indexA up to but not including `indexB`.
  
  @param {Number} indexA An integer between `0` and one less than the
  length of the text.
  @param {Number} [indexB] An integer between `0` and the length of the
  string. If omitted, extracts characters to the end of the text.