On day 80, I’ve explained that we can check whether a container has a specific property and value assigned and apply additional styles based on this condition. On day 82, I’ve explained that the value of a property can come from different sources, undergo adjustments before it becomes the actual value, and take on different forms along the way. To use container style queries, it’s important to understand which value's being used in queries.
This post differs from most of the other posts because it’s not about modern CSS, but about CSS fundamentals. When I was writing about custom properties and especially about container style queries, I realized that I had to understand some of the basics of the language first before I could comprehend how certain properties and rules worked.