为什么我们使用 <html>标记虽然我的网站在没有 <html> 的情况下运行完美标签
我需要从网页的开头知道 <html> 标签的用途，尽管网站在没有这些 <html> 的情况下运行完美</html> 标签.
I need to know what is the use of <html> tag from the beginning of the webpage although website runs perfectly without these <html> </html> tags.
我知道 doctype 是必需的，但为什么需要这个 <html> 标签.
I knew that doctype is required but why this <html> tag is required.
推荐答案
<html> 标签不是必需的.
来自 DTD:
<!ELEMENT HTML O O (%html.content;) -- document root element -->
两个O表示开始和结束标记(分别)是可选的.
The two Os indicate that the start and end tags (respectively) are optional.
另一方面，元素是必需的(但语言的设计是为了让浏览器可以暗示它).
The element, on the other hand, is required (but the language is designed so that browsers can imply it).
由于 DOM 由一棵节点树组成，因此您必须有一个节点(根元素)才能挂起其他所有内容，这就是 html 元素.
Since a DOM consists of a tree of nodes, you have to have one node (the root element) for everything else to hang from, and that is the html element.
这也是一个非常有用的地方，可以粘贴将应用于整个文档的 lang 属性.
It is also a really useful place to stick a lang attribute that will apply to the entire document.
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