dir---定义元素内容的文本方向
文字从右向左显示
rtl---right to left ltr---left to right
lang---帮助搜索引擎确认这部分的语言
协助语音合成器使用正确的语言阅读
协助拼写检查和语法检查等
帮助浏览器决定断字，字间距等
translate---定义元素的值在页面载入时是否需要翻译
contenteditable---定义当前元素是否可编辑
spellcheck --- 检测元素中的内容是否拼写错误
hidden --- 隐藏一个元素
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