A recent survey concluded that 40% of the web population are non-English speakers. Many of these use non-English version web browsers. Don't assume that everyone's default character set is the same as yours - explicitly state your intended character set. For western characters this can be achieved with:
I've seen many websites from large reputable companies that fail to specify the character set, and use extended ISO characters for the single apostrophe, em-dash, copyright or trademark symbols. International browsers, especially those in the Far East will fail to render such characters, replacing them with "?", a square box or in some cases combine them with the following byte to form an oriental character. Specifying the character set explicitly prevents this problem.
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