1. prefers-color-scheme media query

    Media query to detect if the user has set their system to use a light or dark color theme.

  2. css at-rule: `@media`: `prefers-color-scheme` media feature

  3. css at-rule: `@media`: `prefers-color-scheme` media feature: `no-preference` value

  4. css property: color-scheme

  5. css property: color-scheme: `only dark` keyword

  6. css property: color-scheme: `only light` keyword

  7. html element: meta: name: color-scheme