バージョン
| DOCTYPE宣言
| 備考
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HTML 2.0 1995/09/22
| <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
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HTML 3.2 1997/01/14
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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HTML 4.0 1997/12/18 revised on 1998/04/24
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
"http://www.w3.org/TR/REC-html40/strict.dtd">
| 厳密型
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
"http://www.w3.org/TR/REC-html40/loose.dtd">
| 移行型
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN"
"http://www.w3.org/TR/REC-html40/frameset.dtd">
| フレーム型
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HTML 4.01 1999/12/24
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
| 厳密型
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
| 移行型
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
| フレーム型
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XHTML 1.0 2000/01/26
| <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
| 厳密型
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<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
| 移行型
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<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
| フレーム型
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XHTML Basic 1.0 2000/12/19
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
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XHTML 1.1 2001/05/31
| <!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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XHTML 2.0 2006/07/26 Working Draft (草案)
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 2.0//EN"
"http://www.w3.org/MarkUp/DTD/xhtml2.dtd">
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XHTML Basic 1.1 2008/07/29
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML Basic 1.1//EN"
"http://www.w3.org/TR/xhtml-basic/xhtml-basic11.dtd">
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HTML 5 2009/08/17 Editor's Draft (編集)
| <!DOCTYPE html>
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