物超所值html
<html></html>
html:xml
<html xmlns="http://www.w3.org/1999/xhtml"
xml:lang="en"></html>
html:4t
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title></title>
<meta http-equiv="Content-Type"
content="text/html;charset=UTF-8">
</head>
<body></body>
</html>
