The new pseudo-classes are: ":first-child", ":last-child", ":nth-child(n)", ":link", ":visited", ":active" ”, “:hover”, “:focus”, “:not()”, etc.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
Structural pseudo-class selector
:first-child The first child node, :last-child The last child node, :nth-child(n) The nth child Node, :nth-last-child(n) The nth child node from the last, :only-child The only child node
:nth-child(n), :nth-last-child(n) and Some special usages limit the selection through things in brackets:
1. odd/event: the odd/even element
2. xn y: the xn y element
Without further ado, let’s talk about the code. The following is to set the pseudo-class selector for the li tag
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
li:first-child {
border: 1px solid black;
}
li:last-child {
background-color: #aaa;
}
li:nth-child(2) {
color: #888;
}
li:nth-last-child(2) {
font-weight: bold;
}
span:only-child {
font-size: 30pt;
}
</style>
</head>
<body>
<ol>
<li>oaaaaaaaaaaa</li>
<li>obbbbbbbbbbb</li>
<li>occccccccccc</li>
<li>odddddddddd</li>
<li>oeeeee</li>
<li><span id="andorid"></span>saaaaaa啊飒飒</li>
</ol>
</body>
</html>
You can see the difference Effect
UI element status pseudo-class selector
:link (element before being visited (usually only a hyperlink)), :visited(has been visited element (usually only a hyperlink), :active (the element being accessed is between the mouse click and release (usually only a hyperlink)), :hover (the element in the mouse hover state), :focus (Element that has received focus)
<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
.a {
font-size: 50px;
}
.a:link {
color: red;
}
.a:visited {
color: grey;
}
.a:active {
color: green;
}
.b {
height: 40px;
width: 200px;
}
.b:focus {
background-color: blue;
}
.c {
height: 40px;
width: 60px;
}
.c:hover {
background-color: skyblue;
}
</style>
</head>
<body>
<a href="#" class="a">aaa</a>
<form action="#">
文本框:<input type="text" name="aaa" class="b" />
<input type="submit" value="提交" class="c" />
</form>
</body>
</html>It started like this
When we click on the hyperlink
After clicking
#Next look at the text box. When we put the focus on the text box (that is, the input of the text box status), get: the style in focus
: The not() pseudo-class selector is equivalent to the subtraction of two selectors. , such as li:not(#a){} modifies all element blocks that match the li selector but do not match the id of aRecommended learning:
The above is the detailed content of What pseudo-classes are added to html5/css3. For more information, please follow other related articles on the PHP Chinese website!
HTML超文本标记语言--超在那里？（文档分析）Aug 02, 2022 pm 06:04 PM本篇文章带大家了解一下HTML（超文本标记语言），介绍一下HTML的本质，HTML文档的结构、HTML文档的基本标签和图像标签、列表、表格标签、媒体元素、表单，希望对大家有所帮助！
html和css算编程语言吗Sep 21, 2022 pm 04:09 PM不算。html是一种用来告知浏览器如何组织页面的标记语言，而CSS是一种用来表现HTML或XML等文件样式的样式设计语言；html和css不具备很强的逻辑性和流程控制功能，缺乏灵活性，且html和css不能按照人类的设计对一件工作进行重复的循环，直至得到让人类满意的答案。
web前端笔试题库之HTML篇Apr 21, 2022 am 11:56 AM总结了一些web前端面试（笔试）题分享给大家，本篇文章就先给大家分享HTML部分的笔试题（附答案），大家可以自己做做，看看能答对几个！
HTML5中画布标签是什么May 18, 2022 pm 04:55 PMHTML5中画布标签是“<canvas>”。canvas标签用于图形的绘制，它只是一个矩形的图形容器，绘制图形必须通过脚本（通常是JavaScript）来完成；开发者可利用多种js方法来在canvas中绘制路径、盒、圆、字符以及添加图像等。
html中document是什么Jun 17, 2022 pm 04:18 PM在html中，document是文档对象的意思，代表浏览器窗口的文档；document对象是window对象的子对象，所以可通过“window.document”属性对其进行访问，每个载入浏览器的HTML文档都会成为Document对象。
html5废弃了哪个列表标签Jun 01, 2022 pm 06:32 PMhtml5废弃了dir列表标签。dir标签被用来定义目录列表，一般和li标签配合使用，在dir标签对中通过li标签来设置列表项，语法“<dir><li>列表项值</li>...</dir>”。HTML5已经不支持dir，可使用ul标签取代。
Html5怎么取消td边框May 18, 2022 pm 06:57 PM3种取消方法：1、给td元素添加“border:none”无边框样式即可，语法“td{border:none}”。2、给td元素添加“border:0”样式，语法“td{border:0;}”，将td边框的宽度设置为0即可。3、给td元素添加“border:transparent”样式，语法“td{border:transparent;}”，将td边框的颜色设置为透明即可。
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
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
SublimeText3 English version
Recommended: Win version, supports code prompts!
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
