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Syntax html

Both html tags may be omitted if the first thing inside the html element is not a comment, or if the html element is not followed by a comment.

Valid Syntaxes: 1, 2, 3, 4

Valid Syntax 1
html start, end tags present
1 2 3 4 5 6 7 8 9	<!doctype html> <html> <head> <⁄head> <body> <⁄body> <⁄html>

Valid Syntax 2
only html start tag present
1 2 3 4 5 6 7 8 9	<!doctype html> <html> <head> <⁄head> <body> <⁄body>

Valid Syntax 3
only html end tag present
1 2 3 4 5 6 7 8 9	<!doctype html> <head> <⁄head> <body> <⁄body> <⁄html>

Valid Syntax 4
html start, end tags absent
1 2 3 4 5 6 7 8 9	<!doctype html> <head> <⁄head> <body> <⁄body>

HTML5 html syntax, Tutorial