CSS 개념 및 구조 이해

Understanding CSS Concepts and Structure

CSS (Cascading Style Sheets) is a styling language used to describe the presentation of a document written in HTML or XML. It is used to control the layout, colors, fonts, and other visual aspects of a web page. Understanding the concepts and structure of CSS is essential for creating visually appealing and responsive web pages. In this blog post, we will discuss the key concepts and structure of CSS.

Key Concepts of CSS

Selectors

Selectors are used to target specific HTML elements and apply styles to them. There are several types of selectors, including element selectors, class selectors, ID selectors, and attribute selectors. Element selectors target specific HTML elements, while class selectors target elements with a specific class attribute. ID selectors target elements with a specific ID attribute, and attribute selectors target elements with a specific attribute value.

Properties

CSS properties define the visual appearance of HTML elements. Properties can be used to set the color, font, size, and other visual aspects of an element. There are hundreds of CSS properties available, and they can be grouped into categories such as layout, typography, and color.

Values

Values are used to set the specific values for CSS properties. For example, the font-size property can be set to a value of 12px, 16px, or any other size. Values can be expressed in different units, such as pixels, ems, or percentages.

Cascading

Cascading is the process by which multiple CSS rules are applied to an element. When there are conflicting rules, the most specific rule takes precedence. For example, if there is a rule that applies to all paragraphs and a more specific rule that applies to a paragraph with a specific class, the more specific rule will be applied.

Inheritance

Inheritance is the process by which certain CSS properties are inherited by child elements from their parent elements. For example, if a font-size property is set on a parent element, all child elements will inherit that font size unless a different font-size property is set on the child element.

Structure of CSS

CSS Rules

CSS rules consist of a selector and a set of properties and values. The selector targets the HTML element to which the styles will be applied, and the properties and values define the visual appearance of the element. Here is an example of a CSS rule:

p {
    color: red;
    font-size: 16px;
}

In this example, the selector targets all paragraph elements, and the properties and values set the color to red and the font size to 16 pixels.

CSS Declarations

CSS declarations consist of a property and a value. Declarations are used to define the visual appearance of an HTML element. Here is an example of a CSS declaration:

color: red;

In this example, the property is color, and the value is red.

CSS Comments

CSS comments are used to add notes or explanations to the code. Comments are not displayed on the web page and are only visible in the CSS file. Here is an example of a CSS comment:

/* This is a comment */

Conclusion

In conclusion, understanding the key concepts and structure of CSS is essential for creating visually appealing and responsive web pages. Selectors, properties, values, cascading, and inheritance are the key concepts of CSS. CSS rules, declarations, and comments are the building blocks of CSS structure. By mastering these concepts and structure, you can create beautiful and functional web pages.