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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.
I knew that doctype is required but why this <html> tag is required.
843
The <html> tag is not required.
From the DTD:
<!ELEMENT HTML O O (%html.content;) -- document root element -->
The two Os indicate that the start and end tags (respectively) are optional.
The element, on the other hand, is required (but the language is designed so that browsers can imply it).
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.
It is also a really useful place to stick a lang attribute that will apply to the entire document.
54
You don't have to use it, it's optional:
7.3 The HTML element
Start tag: optional, End tag: optional
Source: http://www.w3.org/TR/html401/struct/global.html#h-7.3
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