code: function getFeedback() {
          var out;
          out = this.textareaElement ?
              this.textareaElement.value : this._feedback;
          return out ? out.trim() : out;
      }
docs: ## Helper functions. 
  ### getFeedback
  
  Returns the value of the feedback textarea or in `_feedback`
  
  Must be invoked with right context
  
  @return {string|null} The value of the feedback, if any