CSStyylisäännöistä

CSStyylisäännöistä is a Finnish term referring to CSS (Cascading Style Sheets) rules. CSS is a stylesheet language used for describing the presentation of a document written in HTML or XML. It controls how elements are displayed on screen, on paper, in speech, or on other media. CSS defines how to render elements on screen, thus taking care of the layout and visual appearance of websites.

A CSS rule consists of a selector and a declaration block. The selector points to the HTML element(s) you want to style. The declaration block contains one or more declarations, separated by semicolons. Each declaration consists of a CSS property and a value, which are separated by a colon. For example, `p { color: blue; font-size: 16px; }` is a CSS rule where `p` is the selector, and `color: blue;` and `font-size: 16px;` are declarations.

There are various types of selectors in CSS, including element selectors, class selectors, ID selectors, attribute selectors, and pseudo-classes. These selectors allow for precise targeting of HTML elements to apply specific styles. The cascading nature of CSS means that styles can be applied from multiple sources (browser defaults, user styles, author styles) and are resolved based on their specificity and order of appearance. Understanding CSStyylisäännöistä is fundamental for web developers and designers to create visually appealing and user-friendly websites.