目录 [1]accesskey [2]class [3]dir [4]id [5]lang [6]style [7]tabindex [8]title [9]contenteditable [10]contentmenu [11]data-* [12]draggable [13]dropzone [14]hidden [15]spellcheck [16]translate
前面的话
在HTML中,属性能表达相当丰富的语义,而且属性也会额外提供很多实用的功能,HTML共支持16个常见的全局属性。
HTML原有属性
accesskey
作用:浏览器用来创建激活或聚焦元素的快捷键
值:一个键盘字符如 O
范围:支持该属性的元素有、、
注意:使用该属性可能在新窗口打开链接时可能会被浏览器屏蔽
<div> <a href="http://www.baidu.com" accesskey="b">百度</a> <a href="http://www.taobao.com" accesskey="a">阿里</a> <a href="http://www.qq.com" accesskey="t">腾讯</a> <p>快捷键(alt+b)可以跳转到百度;快捷键(alt+a)可以跳转到阿里;快捷键(alt+t)可以跳转到腾讯</p></div>
class
作用:规定元素的一个或多个类名
值:多个类名用空格分隔
注意:类名不能以数字开头
dir
作用:文字的方向
值:ltr/rtl/auto
id
作用:规定元素的唯一标识
注意:若浏览器中出现多个id名的情况,CSS样式对所以该id名的元素都生效,但js脚本仅对第一个出现该id名的元素生效
lang
作用:规定元素内容的语言
值:en英文/zn中文
style
作用:设置元素的行间样式
tabindex
作用:规定元素的tab键次序
值:
<div> <a href="http://www.baidu.com" tabindex="3">百度</a> <a href="http://www.taobao.com" tabindex="2">阿里</a> <a href="http://www.qq.com" tabindex="1">腾讯</a> </div>
title
作用:规定关于元素的额外信息,鼠标移到元素上时显示一段提示文本
HTML5新增属性
contenteditable
作用:指定是否可以在浏览器里编辑内容
值:true/false
注意:设置document.designMode ='on'时,页面的任意位置都可以编辑;使用contenteditable ='true'则只对具体元素和其包含的元素起作用
移动端:移动端ios5以及android3之后才支持该属性
选中文字后,点击下列相应属性值可进行演示
contextmenu(没有浏览器支持)
作用:跟元素关联的右键菜单
值:

The 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.

The 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 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.

The 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.

HTMLisnotaprogramminglanguage;itisamarkuplanguage.1)HTMLstructuresandformatswebcontentusingtags.2)ItworkswithCSSforstylingandJavaScriptforinteractivity,enhancingwebdevelopment.

HTML 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.

HTML 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.

WebdevelopmentreliesonHTML,CSS,andJavaScript:1)HTMLstructurescontent,2)CSSstylesit,and3)JavaScriptaddsinteractivity,formingthebasisofmodernwebexperiences.


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