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
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