The Document structure

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All HTML documents should be started with the <html> tag and ended with the </html> tag.

They consist of two sections:

The head should be enclosed within the <head> and </head> tags.

The main document content (what is visible in the browser window) should be contained within the <body> and </body> tags.

<html>
<head>
</head>
<body>
</body>
</html>

<html><head></head><body></body></html>

<html>

<head>
			
</head>

<body>

</body>

</html>

<HTML>

<HEAD>
			
</HEAD>

<BODY>

</BODY>

</HTML>

The four examples above (a, b, c & d) are all excepted mark-up, but c & d are preferred because they are easier to read.

As can be seen in examples c & d both lowercase and uppercase letters are allowed.