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The DOCTYPE is a required preamble for HTML5 websites.
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 youyou.com in terms of content, traffic and structure
youtube.com
163.com
top100.cn
youku.com
ynet.com
kong.net
sohu.com
qianqian.com