Summary of the use of selectors in css
Tag, Wildcard selector
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>标签选择器</title>
<style type="text/css">
<!--
body:标签选择器
*：通配符选择器
.：类选择器
，：并集选择器
CSS属性：
Text-align Center,left,right 文字居中格式
Font-size 18px 设置文字大小
Font-family 微软雅黑,宋体 设置字体
Font-weight Normal默认，bold粗体，100px 设置字体加粗
Font-style Normal默认，italic斜体 设置字体风格
Color 颜色 设置文字颜色
-->
body{
background:url("xia.jpg");
}
p{
font-size:50px;
color:green;
background-color:blue;
width:300px;
height:200px;
}
*{
font-size: 100px;
color: red;
}
</style>
</head>
<body>
<h1>111</h1>
<p>14期威武</p>
</body>
</html>Class selector
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.G{
font-size: 200px;
color:red;
}
.o1{
font-size: 200px;
color: blue;
}
.o2{
font-size: 200px;
color: yellow;
}
.g1{
font-size: 200px;
color: green;
}
.l{
font-size: 200px;
color: pink;
}
.e{
font-size: 200px;
color: black;
}
</style>
</head>
<body>
<span class="G">G</span>
<span class="o1">o</span>
<span class="o2">o</span>
<span class="g1">g</span>
<span class="l">l</span>
<span class="e">e</span>
</body>
</html>Compound selector: Intersection selector
selector + selector (no space in between)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box{
font-size:50px;
}
p.box{
color:red;
}
p#miss{
width: 400px;
height: 300px;
background-color:yellow;
}
</style>
</head>
<body>
<!--其实无非是浏览器寻找标签顺序，第一个找到p.box即可；第二个找到
.box类即可
-->
<p class="box">14期威武</p>
<p class="box">14期霸气</p>
<p id="miss">14期万岁</p>
</body>
</html>Descendant selector and descendant selector: actually contain Relationship
Descendant selector: can be inherited across generations Selector + space + selector
Descendant selector: Can only find the first descendant Selector+>+Selector
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
.box span{
color:red;
}
</style>
</head>
<body>
<!--
下面p标签会找到.box类，由于span是后代选择器选择对象，即使隔代也可继承，所以p标签
下面的span标签也可继承
-->
<p class="box">
<p><span class="miss">14期威武</span>
<span>14期好人</span>
</p>
</p>
<p class="box"><span>14霸气</span></p>
</body>
</html>The above is the detailed content of Summary of the use of selectors in css. For more information, please follow other related articles on the PHP Chinese website!
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
1387
52
How to use bootstrap in vue
Apr 07, 2025 pm 11:33 PM
Using Bootstrap in Vue.js is divided into five steps: Install Bootstrap. Import Bootstrap in main.js. Use the Bootstrap component directly in the template. Optional: Custom style. Optional: Use plug-ins.
The Roles of HTML, CSS, and JavaScript: Core Responsibilities
Apr 08, 2025 pm 07:05 PM
HTML defines the web structure, CSS is responsible for style and layout, and JavaScript gives dynamic interaction. The three perform their duties in web development and jointly build a colorful website.
How to write split lines on bootstrap
Apr 07, 2025 pm 03:12 PM
There are two ways to create a Bootstrap split line: using the tag, which creates a horizontal split line. Use the CSS border property to create custom style split lines.
Understanding HTML, CSS, and JavaScript: A Beginner's Guide
Apr 12, 2025 am 12:02 AM
WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
How to resize bootstrap
Apr 07, 2025 pm 03:18 PM
To adjust the size of elements in Bootstrap, you can use the dimension class, which includes: adjusting width: .col-, .w-, .mw-adjust height: .h-, .min-h-, .max-h-
How to use bootstrap button
Apr 07, 2025 pm 03:09 PM
How to use the Bootstrap button? Introduce Bootstrap CSS to create button elements and add Bootstrap button class to add button text
How to set up the framework for bootstrap
Apr 07, 2025 pm 03:27 PM
To set up the Bootstrap framework, you need to follow these steps: 1. Reference the Bootstrap file via CDN; 2. Download and host the file on your own server; 3. Include the Bootstrap file in HTML; 4. Compile Sass/Less as needed; 5. Import a custom file (optional). Once setup is complete, you can use Bootstrap's grid systems, components, and styles to create responsive websites and applications.
How to insert pictures on bootstrap
Apr 07, 2025 pm 03:30 PM
There are several ways to insert images in Bootstrap: insert images directly, using the HTML img tag. With the Bootstrap image component, you can provide responsive images and more styles. Set the image size, use the img-fluid class to make the image adaptable. Set the border, using the img-bordered class. Set the rounded corners and use the img-rounded class. Set the shadow, use the shadow class. Resize and position the image, using CSS style. Using the background image, use the background-image CSS property.
