The Unicode Byte-Order Mark (BOM) in UTF-8 encoded files is known to cause problems for some text editors and older browsers. You may want to consider avoiding its use until it is better supported.
意思是说使用utf-8的格式编码会在一些编辑器和老的浏览器上产生问题，最好是考虑避免这些问题，除非它们得到更好的支持。
Some toolkits were unable to parse the Unicode byte order mark sent by other toolkits.
有些工具包不能对其它工具包发送过来的 Unicode 字节顺序标志进行语法分析。
All three of these may or may not be preceded by a Unicode byte order mark in either UTF-8, big-endian UTF-16, or little-endian UTF-16.
所有这三行之前都可能有Unicode字节序标记，如utf - 8、big - endian UTF - 16或little - endian UTF - 16。
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