Test your knowledge: Color and Color Spaces in CSS

Review

1. In `color: oklch(60% 0.15 250)`, what is `oklch(60% 0.15 250)`?

   `color` is the property and the `oklch(...)` expression is the color value.
2. What color space do ordinary hexadecimal CSS colors represent?

   Hex notation represents sRGB channel values.
3. How should HSL lightness be understood?

   HSL lightness belongs to the HSL model and should not be treated as a universal perceptual scale.
4. What is a key reason CSS Color 4 adds spaces such as Display-P3 and OKLCH?

   Color 4 expands CSS beyond the narrow sRGB gamut and adds additional color spaces and functions.
5. What does alpha represent in a CSS color?

   Alpha is the transparency component of a color value; the final appearance also depends on compositing.
6. What does `currentColor` resolve to?

   `currentColor` resolves from the element’s computed `color` property.
7. Why can two color transitions have different intermediate colors even with the same endpoints?

   Color interpolation depends on the chosen color space and interpolation rules.
8. What problem does gamut mapping address?

   Gamut mapping handles colors that cannot be directly represented in the target gamut.
9. How should CSS Color 5 features be presented in this curriculum?

   CSS Color 5 is currently a Working Draft, so its additions are developing features and may evolve.
10. Which topic belongs outside the core Color lesson?

    User color preferences and automatic color adjustment belong to CSS Color Adjustment and media-query mechanisms.