docs: function (opts) {
  
          var targetID = opts.target.id
          var element = this.targets[targetID]
  
          if (!element) {
              element = this.targets[targetID] = {
                  paused: false,
                  target: opts.target,
                  actions: []
              }
          }
  
          element.actions.push(opts.action)
  
          opts.action.startWithTarget(opts.target)
      }