code: function canConvert(input) {
      return input != null && (typeof input === 'string' || input.nodeType && (input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11));
  }
docs: Determines whether an input can be converted
  @private
  @param {String|HTMLElement} input Describe this parameter
  @returns Describe what it returns
  @type String|Object|Array|Boolean|Number