1. css at-rule: `@media`: `color-gamut` media feature

2. css at-rule: `@media`: `color-gamut` media feature: `p3` value

3. css at-rule: `@media`: `color-gamut` media feature: `rec2020` value

4. css at-rule: `@media`: `color-gamut` media feature: `srgb` value