1. types: `attr()`: <type-or-unit>

  2. types: `attr()`: <type-or-unit>: <angle>

  3. types: `attr()`: <type-or-unit>: <color>

  4. types: `attr()`: <type-or-unit>: <integer>

  5. types: `attr()`: <type-or-unit>: <length>

  6. types: `attr()`: <type-or-unit>: <number>

  7. types: `attr()`: <type-or-unit>: <percentage>

  8. types: `attr()`: <type-or-unit>: <time>

  9. types: `<gradient>`: `linear-gradient()`: unitless `0` for <angle>

  10. types: `<gradient>`: `repeating-linear-gradient()`: unitless `0` for <angle>

  11. types: `<length>`: `dvb`, `dvh`, `dvi`, `dvmax`, `dvmin`, `dvw` units

  12. types: `<length>`: `lvb`, `lvh`, `lvi`, `lvmax`, `lvmin`, `lvw` units

  13. types: `<length>`: `svb`, `svh`, `svi`, `svmax`, `svmin`, `svw` units