DTD-switches

In a way proprietary features are such features, which belong to the specifications, but implementations broke in purpose existing specifications. New MS IE and Netscape/ Mozilla browsers use DTD-switches, when with certain without DTD or with certain DTD new browsers work in some matters at the same way as older and more buggy browsers.

http://www.nic.fi/~tapio1/Teaching/NonstandardCSS.php3

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