The <html> tag tells the browser that this is an HTML document.
The <html> tag represents the root of an HTML document.
The <html> tag is the container for all other HTML elements (except for the <!DOCTYPE> tag).
HTML5 has added a new attribute: manifest.
The xmlns attribute is required in XHTML, but is invalid in HTML.
However, the HTML validator at http://w3.org does not complain when the xmlns attribute is missing in an XHTML document. This is because the namespace "xmlns=http://www.w3.org/1999/xhtml" is default, and will be added to the <html> tag even if you do not include it.
|manifest||URL||Specifies the address of the document's cache manifest (for offline browsing)|
|xmlns||http://www.w3.org/1999/xhtml||Specifies the XML namespace attribute (If you need your content to conform to XHTML)|
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