Web Front-endHTML TutorialThe attribute class that specifies the class name of an element in htmlThe attribute class that specifies the class name of an element in html
Examples
Using class in HTML documents Attributes:
<html>
<head>
<style type="text/css">
h1.intro {color:blue;}
p.important {color:green;}
</style>
</head>
<body>
<h1 id="Header-nbsp">Header 1</h1>
<p>A paragraph.</p>
<p class="important">Note that this is an important paragraph.</p>
</body>
</html>Definition and usage
The class attribute specifies elements The class name (classname).
The class attribute is most often used to point to a class in a style sheet. However, it can also be used to change HTML elements with specified classes through JavaScript.
Tips and Notes
Note: The class attribute cannot be used in the following HTML elements: base, head, html, meta, param, script, style and title.
Tip: You can assign multiple classes to HTML elements, for example:
Tip: The class name cannot start with a number! Only Internet Explorer supports this practice.
Browser Support
W3C: The "W3C" column indicates whether the attribute is defined in the W3C's HTML/XHTML recommendations.
| IE | Firefox | Opera | Safari | W3C |
| YES | YES | YES | YES | YES |
Syntax
<element class="value">
Attribute value
| Value | Description |
| classname | Specifies the name of the element's class. To specify multiple classes for an element, separate the class names with spaces. |
Example
<div class="dreamdu1">连接div标签与dreamdu1样式<div> <div class="dreamdu12px dreamdublack dreamdubold">使用空格分开多个样式连接div标签<div>
div.dreamdu12px{
font-size: 12px;}
div.dreamdublack{
color: black;}
div.dreamdubold{
font-weight: bold;}You can use multiple classnames, but they must be separated by spaces
The above is the detailed content of The attribute class that specifies the class name of an element in html. For more information, please follow other related articles on the PHP Chinese website!
The Future of HTML, CSS, and JavaScript: Web Development TrendsApr 19, 2025 am 12:02 AMThe future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.
HTML: The Structure, CSS: The Style, JavaScript: The BehaviorApr 18, 2025 am 12:09 AMThe roles of HTML, CSS and JavaScript in web development are: 1. HTML defines the web page structure, 2. CSS controls the web page style, and 3. JavaScript adds dynamic behavior. Together, they build the framework, aesthetics and interactivity of modern websites.
The Future of HTML: Evolution and Trends in Web DesignApr 17, 2025 am 12:12 AMThe future of HTML is full of infinite possibilities. 1) New features and standards will include more semantic tags and the popularity of WebComponents. 2) The web design trend will continue to develop towards responsive and accessible design. 3) Performance optimization will improve the user experience through responsive image loading and lazy loading technologies.
HTML vs. CSS vs. JavaScript: A Comparative OverviewApr 16, 2025 am 12:04 AMThe roles of HTML, CSS and JavaScript in web development are: HTML is responsible for content structure, CSS is responsible for style, and JavaScript is responsible for dynamic behavior. 1. HTML defines the web page structure and content through tags to ensure semantics. 2. CSS controls the web page style through selectors and attributes to make it beautiful and easy to read. 3. JavaScript controls web page behavior through scripts to achieve dynamic and interactive functions.
HTML: Is It a Programming Language or Something Else?Apr 15, 2025 am 12:13 AMHTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.
HTML: Building the Structure of Web PagesApr 14, 2025 am 12:14 AMHTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.
From Text to Websites: The Power of HTMLApr 13, 2025 am 12:07 AMHTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.
Understanding HTML, CSS, and JavaScript: A Beginner's GuideApr 12, 2025 am 12:02 AMWebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.
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
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),
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
SublimeText3 Chinese version
Chinese version, very easy to use
