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Xoc - 10:21 pm on Apr 19, 2001 (gmt 0)
<!DOCTYPE html <!DOCTYPE html <!DOCTYPE html <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN" <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> <!DOCTYPE HTML PUBLIC "ISO/IEC 15445:2000//DTD HyperText Markup Language//EN"> <!DOCTYPE HTML PUBLIC "ISO/IEC 15445:2000//DTD HTML//EN">
These are the ones that I found from the HTML recommendations on the W3 web site. It, of course, doesn't include any ones in preliminary documents, nor any mutations from improper coding. If it is really important to you, you might convince Brett to unleash his spider to go get a bunch of them.
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"DTD/xhtml1-strict.dtd">
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"DTD/xhtml1-transitional.dtd">
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"DTD/xhtml1-frameset.dtd">
"http://www.w3.org/TR/html4/strict.dtd">
"http://www.w3.org/TR/html4/loose.dtd">
"http://www.w3.org/TR/html4/frameset.dtd">
"http://www.w3.org/TR/REC-html40/strict.dtd">
"http://www.w3.org/TR/REC-html40/loose.dtd">
"http://www.w3.org/TR/REC-html40/frameset.dtd">