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