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HTML+CSS HTML ???? ?? ????

<!DOCTYPE html>
<html>
<head>
	<title></title>
</head>
<body>

</body>
</html>

?? ????? html ??? ?????

?? ? ???

<!DOCTYPE> ??? <? ?? HTML ??? ? ?? ???? ???. ;html> ?? ??

<!DOCTYPE> ??? HTML ??? ??? ???? ???? ?? HTML ??? ?? ?????.

HTML 4.01? SGML? ???? ?? ??? HTML 4.01?? <!DOCTYPE> ??? DTD? ?????. DTD? ????? ???? ???? ???? ? ??? ??? ??? ?? ??? ?????.

HTML5? SGML? ???? ?? ???? DTD? ??? ??? ????.

?: ????? ?? ??? ? ? ??? ?? HTML ??? <!DOCTYPE> ??? ?????.

HTML 4.01? HTML5? ???

HTML 4.01?? ? ?? ??? <!DOCTYPE> HTML5?? ? ??? ????:

<!DOCTYPE html>

???? html4.01? ???????. 3 ? ?? ?? ??:

1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR /html4 /strict.dtd">

? DTD?? ?? HTML ??? ??? ???? ??? ?? ??? ? ?? ???? ?? ??(?: ??)? ???? ????. ????? ???? ????. ???? ??? ??? XML? ????? ???.

2.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd ">

? DTD?? ?? ??? ? ?? ???? ?? ??(?: ??)? ??? ?? HTML ??? ??? ???? ????. ????? ???? ????. ???? ??? ??? XML? ????? ???.

3.<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">

? DTD? XHTML 1.0 Transitional? ????? ????? ???? ?????.


??? ?? <!DOCTYPE html>

??? ?? ?? ????? ??????

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<!DOCTYPE html> <html> <head> <title></title> </head> <body> 歡迎學(xué)習(xí)html！ </body> </html>