prefixer() {
    if (this.prefixerCache) {
      return this.prefixerCache
    }

    let filtered = this.all.browsers.selected.filter(i => {
      return supported.includes(i)
    })

    let browsers = new Browsers(
      this.all.browsers.data,
      filtered,
      this.all.options
    )
    this.prefixerCache = new this.Prefixes(
      this.all.data,
      browsers,
      this.all.options
    )
    return this.prefixerCache
  }
Return prefixer only with @supports supported browsers