Chapter 7 Applying CSS Conditionally
As its name suggests, conditional CSS refers to CSS rules that are applied when a condition is met. Conditional CSS consists of conditional grouping rules, and the rule sets nested within. A condition in this context may be a CSS property and value combination, as with the @supports rule. A condition may test for a browser window condition such as width, as with the @media rule. Or a condition may be a device feature such as hover state or pointer input, also as with @media. We'll discuss all this in the chapter.
Both @media and @supports are described by the CSS Conditional Rules Module, Level 3 specification. The @media rule—which you probably know as media queries—is fully defined by the Media Queries ...
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