Part of the answer is that Unicode has a lot of characters, and web pages use only a few, so for web fonts it makes sense to have the user download only ones li

Part of the answer is that Unicode has a lot of characters, and web pages use only a few, so for web fonts it makes sense to have the user download only ones likely to be used. Another part is that some CJK characters look somewhat different in C, J, and K. http://www.unicode.org/faq/han_cjk.html#3 http://www.unicode.org/faq/han_cjk.html#3