Definition and Usage
The <!DOCTYPE> declaration is the very first thing in your document, before the <html> tag. This tag tells the browser which HTML or XHTML specification the document uses.
Tips and Notes
Note: The <!DOCTYPE> tag does not have an end tag!
HTML
HTML 4.01 specifies three document types: Strict, Transitional, and Frameset.
HTML Strict DTD
Use this when you want clean markup, free of presentational clutter. Use this together with Cascading Style Sheets (CSS):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> |
HTML Transitional DTD
The Transitional DTD includes presentation attributes and elements that W3C expects to move to a style sheet. Use this when you need to use HTML's presentational features because your readers don't have browsers that support Cascading Style Sheets (CSS):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
Frameset DTD
The Frameset DTD should be used for documents with frames. The Frameset DTD is equal to the Transitional DTD except for the frameset element replaces the body element:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd"> |
XHTML
XHTML 1.0 specifies three XML document types: Strict, Transitional, and Frameset.
XHTML Strict DTD
Use this DTD when you want clean markup, free of presentational clutter. Use this together with Cascading Style Sheets (CSS):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
XHTML Transitional DTD
Use this DTD when you need to use XHTML's presentational features because your readers don't have browsers that support Cascading Style Sheets (CSS):
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> |
XHTML Frameset DTD
Use this DTD when you want to use frames!
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"> |
To check that you have written a valid XHTML document with a correct DTD, you can link your XHTML page to an XHTML validator.
Attributes: NONE
이 글은 스프링노트에서 작성되었습니다.
'It's WEB' 카테고리의 다른 글
왜 우주선을 타고 별들을 향해 여행하는 것이 불가능한지 12 가지 이유라 (0) | 2007.12.13 |
---|---|
HTTP Status Messages (0) | 2007.08.27 |
HTML 4.01 Entities Reference (0) | 2007.08.27 |
OPML(Outline Processor Markup Language) 이란 무엇인가? (0) | 2007.08.17 |
Mashup: 신종 웹 애플리케이션 (0) | 2007.08.17 |