HTML에 대한 참고 추가 	- doctype, 	- standard, quarks mode 	- xhtml
HTML에 대한 참고 추가
	- doctype,
	- standard, quarks mode
	- xhtml
chintan9/Front-end-Developer-Interview-Questions,crenaz/Front-end-Developer-Interview-Questions,chintan9/Front-end-Developer-Interview-Questions,h5bp/Front-end-Developer-Interview-Questions