"Let’s explore the complexities of how CSS computes the width and height dimensions of elements. This is based on countless late-night hours debugging and fiddling with lots of combinations of CSS properties, reading through the specs, and trying to figure out why some things seem to behave one way or another."
The color-scheme CSS property and the corresponding meta tag allow developers to opt their pages into theme-specific defaults of the user agent stylesheet, such as, for example, form controls, scroll bars, as well as CSS system colors.