�一项检测出来的，但根据选定的@charset解码字符流开头部分无法被解析成一个合适的@charset规则的话，用户代理应该忽略该样式表（If the encoding is detected based on one of the entries in the table above marked "as specified", the user agent ignores the style sheet if it does not parse an appropriate @charset rule at the beginning of the stream of characters resulting from decoding in the chosen @charset.）。这样确保了：
  <ul>
    <li>@charset规则只在