This article mainly introduces to you What are the new pseudo-classes in css3?
First of all, everyone should know what css is, right?
CSS is the abbreviation of Cascading Style Sheet. Translated as "Cascading Style Sheets". Is a markup language for (enhanced) control over web page styles and allows the separation of style information from web content. Simply put, CSS is used to control the style and layout of web pages. And css3 is the latest CSS standard.
So what new attributes or pseudo-classes does this latest standard have compared to the CSS2 standard?
Below we will give you a detailed summary of some new pseudo-classes in css.
1. p:first-of-type
:first-of-type selector matches every element that is the first child element of a specific type of its parent element.
Usage example:
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>:first-of-type使用示例</title>
<head>
<style>
p:first-of-type
{
background:green;
}
</style>
</head>
<body>
<h1 id="first-of-type使用示例">:first-of-type使用示例</h1>
<p>这是第一个p元素。<br>:first-of-type，指定父元素的首个 p 元素的背景色。</p>
<p>这是第二个p元素</p>
<p>这是第三个p元素</p>
<p>这是第四个p元素</p>
</body>
</html>The effect is as follows:
<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>:last-of-type使用示例</title>
<head>
<style>
p:last-of-type
{
background: #ff3844;
}
</style>
</head>
<body>
<h1 id="p-last-of-type使用示例">p:last-of-type使用示例</h1>
<p>这是第一个p元素。</p>
<p>这是第二个p元素</p>
<p>这是第三个p元素</p>
<p>这是第四个p元素<br>:last-of-type，指定父元素的最后一个 p 元素的背景色。</p>
</body>
</html>The effect is as follows:
##3, p:only-of-type
The :only-of-type selector matches every element that is the only child element of a specific type from its parent element.
The usage method is similar to the above example.
4. p:only-child
:only-child selector matches every element that is the only child element of its parent element.
5, p:nth-child(2)
:nth-child(n) The selector matches the Nth child element that belongs to its parent element, regardless of the type of element.
n can be a number, keyword or formula.
6. :enabled :disabled
The disabled state of the form control.
7, :checked
: The checked selector matches every selected input element (only applicable to radio buttons or check boxes).
This article is an introduction to the new pseudo-classes
incss3. I hope it will be helpful to friends in need! If you want to know more about front-end related knowledge, you can follow the PHP Chinese website
CSS3 Video Tutorial, Bootstrap Video Tutorial and other related video tutorials. Welcome everyone to refer to and learn!
The above is the detailed content of What are the new pseudo-classes in CSS3? (Summary with code). For more information, please follow other related articles on the PHP Chinese website!
A Little Reminder That Pseudo Elements are Children, Kinda.Apr 19, 2025 am 11:39 AMHere's a container with some child elements:
Menus with 'Dynamic Hit Areas'Apr 19, 2025 am 11:37 AMFlyout menus! The second you need to implement a menu that uses a hover event to display more menu items, you're in tricky territory. For one, they should
Improving Video Accessibility with WebVTTApr 19, 2025 am 11:27 AM"The power of the Web is in its universality. Access by everyone regardless of disability is an essential aspect."- Tim Berners-Lee
Weekly Platform News: CSS ::marker pseudo-element, pre-rendering web components, adding Webmention to your siteApr 19, 2025 am 11:25 AMIn this week's roundup: datepickers are giving keyboard users headaches, a new web component compiler that helps fight FOUC, we finally get our hands on styling list item markers, and four steps to getting webmentions on your site.
Making width and flexible items play nice togetherApr 19, 2025 am 11:23 AMThe short answer: flex-shrink and flex-basis are probably what you’re lookin’ for.
Weekly Platform News: HTML Inspection in Search Console, Global Scope of Scripts, Babel env Adds defaults QueryApr 19, 2025 am 11:18 AMIn this week's look around the world of web platform news, Google Search Console makes it easier to view crawled markup, we learn that custom properties
IndieWeb and WebmentionsApr 19, 2025 am 11:16 AMThe IndieWeb is a thing! They've got a conference coming up and everything. The New Yorker is even writing about it:
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Dreamweaver CS6
Visual web development tools
