1. (width)
  2. (height)
  3. (device-width)
  4. (device-height)
  5. (orientation) [span1] [span2]
  6. (aspect-ratio)
  7. (device-aspect-ratio)
  8. (color)
  9. (color-index)
  10. (monochrome)
  11. (resolution) [span1 >100dpi] [span2 326dpi] [span3 <1000dpi]
  12. (scan)
  13. (grid)