code: function mapStyle(style) {
    var tag = { once: true, type: 'text/css' }
    if (style.css) tag.cssText = style.css
    if (style.type) tag['data-fela-type'] = style.type
    if (style.rehydration) tag['data-fela-rehydration'] = style.rehydration
    if (style.support) tag['data-fela-support'] = style.support
    if (style.media) tag['media'] = style.media
    return tag
  }
docs: http://fela.js.org/docs/api/fela-dom/renderToMarkup https://github.com/declandewet/vue-meta#style-object