static isBuffered (media, pos) {
    if (media) {
      const buffered = Buffer.get(media)

      if (buffered?.length) {
        for (let i = 0; i < buffered.length; i++) {
          if (pos >= buffered.start(i) && pos <= buffered.end(i)) {
            return true
          }
        }
      }
    }
    return false
  }
@param {HTMLMediaElement} media
@param {number} pos
@returns {Boolean}