CSS is a style sheet language used for styling webpages. It is used to define the look and feel of a web page, and is written in a special syntax called CSS. One of the most common symbols used in CSS is the question mark (?).
The question mark in CSS is used to indicate a conditional statement. A conditional statement is a type of programming statement that performs a certain action if a certain condition is met. For example, if a web page contains an image, the question mark could be used to determine if the image should be displayed or not, depending on the condition.
The question mark is also used to indicate a wildcard character. This is a character that can be used to match any character in a string. For example, if a web page contains a list of items, the question mark could be used to match any item in the list.
The question mark is also used to indicate a special value. This is a value that is not explicitly defined in the CSS code. For example, if a web page contains a text box, the question mark could be used to indicate that the value of the text box is unknown.
The question mark is an important symbol in CSS, and it is used to indicate a variety of different things. It is important to understand the meaning of the question mark when writing CSS code, as it can help to make sure that the code is written correctly.