css3 content attribute
There are four main pseudo-elements in CSS: before/after/first-letter/first-line. In the before/after pseudo-element selector, there is a content attribute that can insert content into the page.
Insert plain text
content: "Inserted article", or content:none does not insert content
#html
<h1>这是h1</h1>
<h2>这是h2</h2>
#css
h1::after{
content:"h1后插入内容"
}
h2::after{
content:none
}Embedded text symbols
You can use the content attribute The open-quote attribute value and the close-quote attribute value add nested literal symbols such as brackets, single quotes, and double quotes on both sides of the string. open-quote is used to add the starting text symbol, and close-quote is used to add the ending text symbol. Modify the above css:
h1{
quotes:"(" ")"; /*利用元素的quotes属性指定文字符号*/
}
h1::before{
content:open-quote;
}
h1::after{
content:close-quote;
}
h2{
quotes:"\"" "\""; /*添加双引号要转义*/
}
h2::before{
content:open-quote;
}
h2::after{
content:close-quote;
}Insert picture
content attribute can also insert pictures directly before/after the element
#html
<h3>这是h3</h3>
#css
h3::after{
content:url(图片路径)
}Insert attribute value of element
The content attribute can directly use attr to obtain the attributes of the element and insert it into the corresponding position.
#html
<a href="http://www.php.cn">这是链接</a>
#css
a:after{
content:attr(href);
}Insert item number
Use the counter attribute of content to append consecutive numbers to multiple items.
#html
<h1>大标题</h1>
<p>文字</p>
<h1>大标题</h1>
<p>文字</p>
<h1>大标题</h1>
<p>文字</p>
<h1>大标题</h1>
<p>文字</p>
#css
h1:before{
content:counter(my)'.';
}
h1{
counter-increment:my;
}Item number modification
The default inserted item number It is numerical, 1,2,3. . . Automatic increment, you can also add text and styles to the project number. Still use the above html, css modification as follows:
h1:before{
content:'第'counter(my)'章';
color:red;
font-size:42px;
}
h1{
counter-increment:my;
}Specify number type
Use content (counter name, number type) format The syntax specifies the numbering type. The reference to the numbering type can be based on the list-style-type attribute value of ul. Using the above html, the css is modified as follows:
h1:before{
content:counter(my,upper-alpha);
color:red;
font-size:42px;
}
h1{
counter-increment:my;
}Number nesting
Large numbers are nested within medium numbers, and medium numbers are nested within small numbers.
#html
<h1>大标题</h1>
<p>文字1</p>
<p>文字2</p>
<p>文字3</p>
<h1>大标题</h1>
<p>文字1</p>
<p>文字2</p>
<p>文字3</p>
<h1>大标题</h1>
<p>文字1</p>
<p>文字2</p>
<p>文字3</p>
#css
h1::before{
content:counter(h)'.';
}
h1{
counter-increment:h;
}
p::before{
content:counter(p)'.';
margin-left:40px;
}
p{
counter-increment:p;
}It can be found in the output of the example that the numbers of p are consecutive. If you renumber the three p's after each h1, you can use the counter-reset attribute to reset it. Modifying the css of the above h1:
h1{
counter-increment:h;
counter-reset:p;
}can also achieve more complex nesting, such as three-level nesting. .
#html
<h1>大标题</h1>
<h2>中标题</h2>
<h3>小标题</h3>
<h3>小标题</h3>
<h2>中标题</h2>
<h3>小标题</h3>
<h3>小标题</h3>
<h1>大标题</h1>
<h2>中标题</h2>
<h3>小标题</h3>
<h3>小标题</h3>
<h2>中标题</h2>
<h3>小标题</h3>
<h3>小标题</h3>
#css
h1::before{
content:counter(h1)'.';
}
h1{
counter-increment:h1;
counter-reset:h2;
}
h2::before{
content:counter(h1) '-' counter(h2);
}
h2{
counter-increment:h2;
counter-reset:h3;
margin-left:40px;
}
h3::before{
content:counter(h1) '-' counter(h2) '-' counter(h3);
}
h3{
counter-increment:h3;
margin-left:80px;
}The complete DEMO is given below
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS content</title>
<style>
.string p:after {
margin-left: -16px;
background: #fff;
content: "支持";
color: #f00;
}
.attr p:after {
content: attr(title);
}
.url p:before {
content: url(https://img.php.cn/upload/article/000/000/009/587d87ecca52d563.jpg);
display: block;
}
.test ol {
margin: 16px 0;
padding: 0;
list-style: none;
}
.counter1 li {
counter-increment: testname;
}
.counter1 li:before {
content: counter(testname)":";
color: #f00;
font-family: georgia,serif,sans-serif;
}
.counter2 li {
counter-increment: testname2;
}
.counter2 li:before {
content: counter(testname2,lower-roman)":";
color: #f00;
font-family: georgia,serif,sans-serif;
}
.counter3 ol ol {
margin: 0 0 0 28px;
}
.counter3 li {
padding: 2px 0;
counter-increment: testname3;
}
.counter3 li:before {
content: counter(testname3,float)":";
color: #f00;
font-family: georgia,serif,sans-serif;
}
.counter3 li li {
counter-increment: testname4;
}
.counter3 li li:before {
content: counter(testname3,decimal)"."counter(testname4,decimal)":";
}
.counter3 li li li {
counter-increment: testname5;
}
.counter3 li li li:before {
content: counter(testname3,decimal)"."counter(testname4,decimal)"."counter(testname5,decimal)":";
}
</style>
</head>
<body>
<ul>
<li>
<strong>string：</strong>
<p>你的浏览器是否支持content属性：否</p>
</li>
<li>
<strong>attr：</strong>
<p title="如果你看到我则说明你目前使用的浏览器支持content属性"></p>
</li>
<li>
<strong>url()：</strong>
<p>如果你看到图片则说明你目前使用的浏览器支持content属性</p>
</li>
<li>
<strong>counter(name)：</strong>
<ol>
<li>列表项</li>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>
<strong>counter(name,list-style-type)：</strong>
<ol>
<li>列表项</li>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>
<strong>counter(name)拓展应用：</strong>
<ol>
<li>列表项
<ol>
<li>列表项
<ol>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>列表项</li>
</ol>
</li>
<li>列表项
<ol>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
<li>列表项
<ol>
<li>列表项</li>
<li>列表项</li>
</ol>
</li>
</ol>
</li>
</ul>
</body>
</html>
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1653
14
1413
52
1305
25
1251
29
1224
24
Stacked Cards with Sticky Positioning and a Dash of Sass
Apr 03, 2025 am 10:30 AM
The other day, I spotted this particularly lovely bit from Corey Ginnivan’s website where a collection of cards stack on top of one another as you scroll.
Google Fonts Variable Fonts
Apr 09, 2025 am 10:42 AM
I see Google Fonts rolled out a new design (Tweet). Compared to the last big redesign, this feels much more iterative. I can barely tell the difference
How to Create an Animated Countdown Timer With HTML, CSS and JavaScript
Apr 11, 2025 am 11:29 AM
Have you ever needed a countdown timer on a project? For something like that, it might be natural to reach for a plugin, but it’s actually a lot more
HTML Data Attributes Guide
Apr 11, 2025 am 11:50 AM
Everything you ever wanted to know about data attributes in HTML, CSS, and JavaScript.
How to select a child element with the first class name item through CSS?
Apr 05, 2025 pm 11:24 PM
When the number of elements is not fixed, how to select the first child element of the specified class name through CSS. When processing HTML structure, you often encounter different elements...
Why are the purple slashed areas in the Flex layout mistakenly considered 'overflow space'?
Apr 05, 2025 pm 05:51 PM
Questions about purple slash areas in Flex layouts When using Flex layouts, you may encounter some confusing phenomena, such as in the developer tools (d...
A Proof of Concept for Making Sass Faster
Apr 16, 2025 am 10:38 AM
At the start of a new project, Sass compilation happens in the blink of an eye. This feels great, especially when it’s paired with Browsersync, which reloads
In front-end development, how to use CSS and JavaScript to achieve searchlight effects similar to Windows 10 settings interface?
Apr 05, 2025 pm 10:21 PM
How to implement Windows-like in front-end development...
