The DOCTYPE is a required preamble for HTML5 websites.
Websites using https protocol.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
These websites are related to hub4u.or.kr in terms of content, traffic and structure
nkpeople.or.kr
ymschool.org
unischool.org
navienamerica.com
pscore.org
hibrain.net
naver.com
unibook.unikorea.go.kr