#HTML <html>
The <html> HTML element represents the root (top-level element) of an HTML document, so it is also referred to as the root element. All other elements must be descendants of this element. There can be only one <html> element in a document.
Please see HTML Element Manual for more information about HTML elements.。
#Attributes
Please see HTML global attributes to learn about the global attributes of HTML elements.
versionDeprecated : Specifies the version of the HTML Document Type Definition that governs the current document. This attribute is not needed, because it is redundant with the version information in the document type declaration.xmlns: Specifies the XML Namespace of the document. Default value is"http://www.w3.org/1999/xhtml". This is required in documents parsed with XML parsers, and optional in text/html documents.