code: function parseFeatures (features) {
    features = defaultValue(features, '')
    if (!features) {
      return {}
    }
  
    return features
      .split(',')
      .map(toNameAndValuePair)
      .reduce(toPlainObject, {})
  }
docs: https://www.w3.org/TR/cssom-view-1/#the-features-argument-to-the-open%28%29-method