1. R VE
    1. @media queries
      1. TOC
      2. Media types (CSS2)
      3. Dimensions (CSS3/CSS4)
        1. width ()
        2. height ()
        3. device-width ()
        4. device-height ()
        5. orientation
        6. aspect-ratio
        7. device-aspect-ratio
      4. Capabilities (CSS3/CSS4)
        1. color
        2. color-index
        3. monochrome
        4. resolution
        5. device-pixel-ratio
        6. scan
        7. grid
        8. script
        9. pointer
        10. hover
        11. luminosity
    2. Testing