a - forced-colors media feature forced-colors applies styles when the user agent has enabled forced colors mode An example of forced colors mode is High Contrast mode in Windows Values: none and active box-shadow, text-shadow, background-image are forced to none color-scheme is forced to light dark and scrollbar-color is forced to auto color, background-color, text-decoration-color, text-emphasis-color, border-color, outline-color... ... and column-rule-color use browser-specified values @media (forced-colors: active) → applies style when forced-colors mode is enable
b - grid media feature grid feature checks whether the output device uses a grid-based screen values: 0 or 1, 1 uses a grid-based screen Computer and smartphones have bitmap-based screens Text-only terminals and simple phones are grid-based @media (grid: 0) → applies styles to normal devices (computers and smartphones) @media (grid: 1) → applies styles to grid-based devices