What does css selector do?

Introduction to CSS Selectors CSS selectors are used to accurately select HTML elements for application of style rules. They allow developers to make selections based on element type, ID, class, attribute, or element relationship. These selector types include wildcard selectors, element selectors, ID selectors, class selectors, attribute selectors, child element selectors, and adjacent element selectors. CSS selectors can be used to select elements and apply specific style rules to them in an efficient manner.

CSS Selector: Used to accurately select HTML elements

CSS selector is a powerful tool that can be used to Precisely select HTML elements for applying style rules. They allow web developers to select target elements based on their type, ID, class, attributes, or relationship to other elements.

Types of CSS selectors

• Wildcard selector (*): Select all elements on the page.
• Element selector (element) : Select elements based on element type, for example p represents a paragraph element.
• ID selector (#id) : Selects elements based on their unique ID identifier.
• Class selector (.class) : Select elements based on their class name.
• Attribute selector ([attribute]) : Select elements based on their attribute values, for example [href] means having the href attribute element.
• Child element selector (parent > child) : Select elements that contain child elements in the parent element.
• Adjacent element selector (parent sibling) : Select the sibling element immediately following the parent element.

Usage of CSS Selectors

CSS selectors are used to select HTML elements to apply style rules to. These rules are contained in style sheets (such as CSS files) or inline styles (such as in the style attribute).

For example, the following code applies a red text style to a paragraph element with a class name of "error":

.error {
  color: red;
}

Advantages of CSS Selectors

CSS selectors have the following advantages:

• Precision: They allow developers to precisely select specific elements to be styled.
• Flexibility: They are available in various types and can be selected based on different criteria.
• Composability: They can be combined to create more complex and targeted selectors.
• Efficiency: They optimize the browser's process of selecting elements, thereby increasing web page loading speeds.

The above is the detailed content of What does css selector do?. For more information, please follow other related articles on the PHP Chinese website!