help() {
    if (!this.data.description) {
      return null
    }

    // support an override template for labels
    if (this.isTemplate('help')) {
      return this.processTemplate('help', this.data.description)
    }

    // generate the default help element
    return this.markup('span', '?', {
      className: 'tooltip-element',
      tooltip: this.data.description,
    })
  }
Build a help element
@return {Object} dom element to render the help text