CSS character encoding <p>According to <a href="http://www.w3.org/International/questions/qa-css-charset.en.php" rel="nofollow">W3C</a>, CSS can set its character encoding by <code>@charset</code> in the first line, is it valid to to say that I should put <code>@charset "UTF-8"</code> in every CSS i made, even it only contains ASCII characters?</p> <p>Will there be any performance penalty after I declare it using UTF-8 ?</p> <p><em>p.s. I can't think of a way to test it out.</em></p>