elice/study

[CS] DOCTYPE

1. DOCTYPE

Document Type์˜ ์•ฝ์ž๋กœ, HTML์ด ์–ด๋–ค ๋ฒ„์ „์œผ๋กœ ์ž‘์„ฑ๋˜์—ˆ๋Š”์ง€ ๋ฏธ๋ฆฌ ์„ ์–ธํ•˜์—ฌ ์›น๋ธŒ๋ผ์šฐ์ €๊ฐ€ ๋‚ด์šฉ์„ ์˜ฌ๋ฐ”๋กœ ํ‘œ์‹œํ•  ์ˆ˜ ์žˆ๋„๋ก ํ•ด์ฃผ๋Š” ๊ฒƒ์ด๋‹ค.

<!DOCTYPE> ์œผ๋กœ ์„ ์–ธํ•˜๋Š”๋ฐ, ์ด๊ฑธ ํ•ด์ฃผ์ง€ ์•Š์œผ๋ฉด ํ˜ธํ™˜ ๋ชจ๋“œ(quirks mode)๋กœ ๋™์ž‘ํ•œ๋‹ค.

ํ˜ธํ™˜ ๋ชจ๋“œ์˜ ๊ฒฝ์šฐ ๊ฐ ๋ธŒ๋ผ์šฐ์ €๋งˆ๋‹ค ๋ฌธ์„œ๋ฅผ ๋‚˜ํƒ€๋‚ด๋Š” ๋ฐฉ์‹์ด ๋‹ค๋ฅด๊ธฐ ๋•Œ๋ฌธ์— ํฌ๋กœ์Šค ๋ธŒ๋ผ์šฐ์ง• ์ด์Šˆ๊ฐ€ ํ›จ์”ฌ ์‹ฌํ•ด์ง€๊ฒŒ ๋œ๋‹ค.

DOCTYPE ์„ ์–ธ X: ์ฟผํฌ ๋ชจ๋“œ๋กœ ๋ Œ๋”๋ง → ๋ธŒ๋ผ์šฐ์ €๋งˆ๋‹ค ๋‹ค๋ฅธ ๊ฒฐ๊ณผ๋ฌผ ์ถœ๋ ฅ
DOCTYPE ์„ ์–ธ O: ํ‘œ์ค€ ๋ชจ๋“œ๋กœ ๋ Œ๋”๋ง → ๋ธŒ๋ผ์šฐ์ €๋ณ„๋กœ ๊ฐ™์€ ๋ ˆ์ด์•„์›ƒ ๊ฒฐ๊ณผ๋ฌผ ์ถœ๋ ฅ

 

2. DTD (Document Type Definition)

DTD(Document Type Definition)๋ž€ ๋ฌธ์„œ ํ˜•์‹์„ ์ •์˜ํ•ด๋†“์€ ๊ฒƒ์œผ๋กœ DOCTYPE์„ ๋ช…์‹œํ•  ๋•Œ ์‚ฌ์šฉํ•œ๋‹ค.

์ฆ‰, HTML ๋ฌธ์„œ๊ฐ€ ์–ด๋–ค ๋ฌธ์„œ ํ˜•์‹์„ ๋”ฐ๋ฅด๋Š”์ง€ DOCTYPE์—์„œ DTD๋ฅผ ์ง€์ •ํ•˜๋Š” ๊ฒƒ์ด๋‹ค.

์˜ˆ์‹œ๋กœ ์•„๋ž˜์™€ ๊ฐ™์€ ๊ฒƒ๋“ค์ด ์žˆ๊ณ  W3C Recommended list of Doctype declarations ์—์„œ ๋”์šฑ ์ž์„ธํ•˜๊ฒŒ ํ™•์ธ ๊ฐ€๋Šฅํ•˜๋‹ค.

  • XHTML 1.1
  • XHTML 1.0
    • Strict DTD
    • Transitional DTD
    • Frameset DTD
  • HTML 4.01
    • Strict DTD
    • Transitional DTD
    • Frameset DTD
  • HTML 5

ํ˜„ ์‹œ์ ์—์„ , HTML 5์˜ DTD๋กœ DOCTYPE์„ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ์ด ์ œ์ผ ๋ฐ”๋žŒ์งํ•˜๋‹ค.

<!DOCTYPE html>

 

 

 

์ฐธ๊ณ 

https://github.com/baeharam/Must-Know-About-Frontend/blob/main/Notes/html/doctype.md