There is also an optional variant code, the use of which is not defined by any standard and is left up to the application vendor to implement.

还有一个可选的变量代码，其使用是没有任何标准的定义，是留给应用程序供应商执行的。

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The variant attribute (also optional) allows you to further customize the locale to a specific Web browser platform or vendor.

varian t属性(也是可选的)允许您进一步针对特定的Web浏览器平台或供应商定制语言环境。

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