Home Web Front-end CSS Tutorial How to write css selector

How to write css selector

Apr 06, 2024 am 02:24 AM
css css selector id selector Pseudo class selector

<p>CSS selectors are patterns used to select elements in HTML documents. They include element selectors, class selectors, ID selectors, wildcard selectors, and descendant selectors. The syntax of a selector is selector name, operator, and value. Operators include # (ID selector), . (class selector), and * (wildcard selector). When multiple selectors are applied to the same element, the most specific (longest) selector will take precedence. Advanced selectors include adjacent selectors, child element selectors, pseudo-class selectors, and pseudo-element selectors for more precise element selection.

<p>How to write css selector

<p>CSS Selector Writing Guide

<p>What is a CSS selector?

<p>CSS selectors are patterns used to select specific elements in an HTML document.

<p>Selector type

  • Element selector: Select a specific type of element, such as <div>or <p>.
  • Class selector: Selects elements with a specific CSS class name, such as .my-class.
  • ID selector: Select elements with a specific ID attribute, such as #my-id.
  • Wildcard selector:Select all elements, such as *.
  • Descendant selector: Select descendant elements of an ancestor element, such as div p.
<p>Selector syntax

<p>A selector consists of three main parts:

  • Selector name: Specify element type or attribute
  • Operator: Usually used to specify specific conditions
  • Value: Specific value of the selector
<p>Operators for selectors

  • : - Specify the class selector
  • # - Specify the ID selector
  • .: Specify the wildcard selector
<p> The cascade of selectors

<p> When multiple selectors are applied to the same element, the most specific (longest) selector will take precedence.

<p>Example

  • #my-id - Select elements with ID attribute "my-id"
  • .my-class - Selects elements with CSS class name "my-class"
  • div p - Selects all <div>Descendants of elements<p>Elements
  • * - Select all elements
<p>Advanced Selector

<p>In addition to the basic selector types, CSS also supports advanced selectors:

  • Adjacent selector ( ): Selects an element immediately following another After the element, such as p h1
  • ##Child element selector (>): Select the direct child element of an element, such as div > p
  • Pseudo-class selector: Select based on the state or behavior of the element, such as :hover
  • Pseudo-element selection Selector: Select a specific part of an element, such as ::after
By understanding these selectors and their use, you can effectively select elements in your HTML document to Make style settings. <p>

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