HTML5之废弃和更新的元素与属性_html/css_WEB-ITnose
废弃的元素和属性
【1】标签替换
<acronym> 替代:<abbr><applet> 替代:<embed> 或 <object><big> 替代:<h1>或<strong>或<mark><dir> 替代:<ul><frame><frameset><noframes> 替代:CSS或<iframe> <isindex> 替代:表单控件<tt> 用<kbd>或<var>或<code>或<samp>替代<u> 用<em>或<b>或<mark>替代 <xmp> 用<code>替代
【2】CSS替换
<basefont> 用CSS替代<center> 用CSS替代<font> 用CSS替代 <s><strike> 用CSS替代
【3】废弃的属性
<area> nohref<br> clear<li> type<table> cellpadding cellspacing rules summary width
更新的元素和属性
【1】功能变化
<a> 没有href属性的<a>显示成一个占位符，且<a>元素内部支持flow content类型的元素<address> 用<article>、<aside>、<nav>、<section>限定范围<cite> 定义引用 => 用于对一本书、一篇报告或者其他出版的来源资料的引用。<dl> 定义列表 => 表示包含多个name-value的group<head> 不允许包含<object>子元素<label> 浏览器不再将焦点从<label>移动到控件上
【2】语义变化
<b> 粗体文本 -> 在普通文章中仅从文体上突出的不包含任何额外重要性的一段文本。例如文档概要中关键字、评论中产品名。 根据HTML5的规范，标题文本使用<h1>-<h6>，强调文本使用<em>，重要文本使用<strong>，标记高亮文本使用<mark>，其他方面的才使用<b><hr> 水平线 -> 定义内容中的主题变化，并显示为一条水平线<i> 斜体文本 -> 表示在普通文章中突出不同意见或语气或其他的一段文本。如一个分类名称、技术术语、谚语等。<menu> 命令列表或菜单 -> 在toolbar和context menus下起作用<small> 小号文本 -> 旁注，用于免责声明、注意事项、法律限制、版权声明等 <strong> 强调文本 -> 重要文本
【3】属性变化
<script>和<style>元素的type属性不是必须项 所有元素的width和height属性不再允许设置值为百分比
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
Is HTML easy to learn for beginners?
Apr 07, 2025 am 12:11 AM
HTML is suitable for beginners because it is simple and easy to learn and can quickly see results. 1) The learning curve of HTML is smooth and easy to get started. 2) Just master the basic tags to start creating web pages. 3) High flexibility and can be used in combination with CSS and JavaScript. 4) Rich learning resources and modern tools support the learning process.
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.
What is an example of a starting tag in HTML?
Apr 06, 2025 am 12:04 AM
AnexampleofastartingtaginHTMLis,whichbeginsaparagraph.StartingtagsareessentialinHTMLastheyinitiateelements,definetheirtypes,andarecrucialforstructuringwebpagesandconstructingtheDOM.
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 implement adaptive layout of Y-axis position in web annotation?
Apr 04, 2025 pm 11:30 PM
The Y-axis position adaptive algorithm for web annotation function This article will explore how to implement annotation functions similar to Word documents, especially how to deal with the interval between annotations...
Gitee Pages static website deployment failed: How to troubleshoot and resolve single file 404 errors?
Apr 04, 2025 pm 11:54 PM
GiteePages static website deployment failed: 404 error troubleshooting and resolution when using Gitee...
How to use CSS3 and JavaScript to achieve the effect of scattering and enlarging the surrounding pictures after clicking?
Apr 05, 2025 am 06:15 AM
To achieve the effect of scattering and enlarging the surrounding images after clicking on the image, many web designs need to achieve an interactive effect: click on a certain image to make the surrounding...
HTML, CSS, and JavaScript: Essential Tools for Web Developers
Apr 09, 2025 am 12:12 AM
HTML, CSS and JavaScript are the three pillars of web development. 1. HTML defines the web page structure and uses tags such as, etc. 2. CSS controls the web page style, using selectors and attributes such as color, font-size, etc. 3. JavaScript realizes dynamic effects and interaction, through event monitoring and DOM operations.
