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No, there hasn't been a direct ?if? statement in CSS. The main thing to distinguish is that some CSS properties work in specific conditions or scenarios. For example, when using the CSS :emtpy selector to check if an element is empty or not, it's a conditional pseudo selector.

Used Property: The two main properties used in conditionally applying a class in CSS are pseudo-classes and media queries. Pseudo-classes: Pseudo-classes are used to select elements based on their state or position. They are represented by a colon (:) followed by the name of the pseudo-class, such as :hover or :active.

A CSS rule consists of two main parts: selector ('h1') and declaration ('color: red'). In HTML, element names are case-insensitive so 'h1' works just as well as 'H1'. The declaration has two parts: property name ('color') and property value ('red').

CSS is, essentially, a language for defining and selectively applying a collection of formatting rules to a webpage. In CSS, a rule is a property followed by list of values for that property, and rules always follow a simple syntax. A property simply specifies which feature is being defined.

CSS Conditional Rules are nothing but a feature of CSS in which the CSS style is applied based on a specific condition. So the condition here can be either true or false and based on the statements/style will get executed. These rules eventually come under CSS at-rule as they start with an @.

The common syntax for this tag is <div dx-class="{PropertyName: N}">... </div> , where PropertyName is the name of a property to which the required CSS style is applied. N represents the list of styles to choose from.