严重的拖延者患者，本来前天就打算写的，奈何拖到的今天才...（对拖延症有啥好的建议还望留言下，感激不尽...）
过完年了，跳槽蠢蠢欲动了，看些基础知识好应对面试，正好就整理整理...
正文开始
1.推出的理由及目标
解决web上存在的各种问题，html5的出现对web来说意义非常重大。
a.web浏览器之间的兼容性很低
制定规范的html标准，详细分析各web浏览器说具有的功能，依次为基准让各大浏览器都符合一个通用的标准。
b.文档结构不够明确
我们之前都大量的使用div元素，没办法区分开正文，功能块，引入的很多语义化元素header,footer,nav等...
c.web应用程序的功能受到限制
web的应用程序跟app差别很大，html5也提供的很多api，各浏览器厂商也在快速封装这些api，弥补功能的受限。
2.语法的改变
a.docpyte声明
HTML5简化了很多细微的语法，例如doctype的声明，你只需要写就行了。
HTML 4:
b.指定的字符编码
HTML 5 指定 UTF-8 编码的方式如下
HTML 4:
c.具有boolean值的属性
可以省略值
d.省略引号
可以引号
具体还有很多，这里就不一一列举了...
3.新增的标签、属性
新增表单的属性
新增a链接的属性
4.废除的标签、属性
废除的a链接属性
5.全局属性
具体详细的资料可自行百度...
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How do I use HTML5 form validation attributes to validate user input?Mar 17, 2025 pm 12:27 PMThe article discusses using HTML5 form validation attributes like required, pattern, min, max, and length limits to validate user input directly in the browser.
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What is the purpose of the <meter> element?Mar 21, 2025 pm 12:35 PMThe article discusses the HTML <meter> element, used for displaying scalar or fractional values within a range, and its common applications in web development. It differentiates <meter> from <progress> and ex
What is the viewport meta tag? Why is it important for responsive design?Mar 20, 2025 pm 05:56 PMThe article discusses the viewport meta tag, essential for responsive web design on mobile devices. It explains how proper use ensures optimal content scaling and user interaction, while misuse can lead to design and accessibility issues.
What are the best practices for cross-browser compatibility in HTML5?Mar 17, 2025 pm 12:20 PMArticle discusses best practices for ensuring HTML5 cross-browser compatibility, focusing on feature detection, progressive enhancement, and testing methods.
How do I use the HTML5 <time> element to represent dates and times semantically?Mar 12, 2025 pm 04:05 PMThis article explains the HTML5 <time> element for semantic date/time representation. It emphasizes the importance of the datetime attribute for machine readability (ISO 8601 format) alongside human-readable text, boosting accessibilit
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