用户代理不需要一定支持元数据机制。对于那些选择支持元数据的用户代理，本规范没有定义元数据应该如何被解读。
User agents are not required to support meta data mechanisms. For those that choose to support meta data, this specification does not define how meta data should be interpreted.
用户代理不需要一定支持元数据机制。对于那些选择支持元数据的用户代理，本规范没有定义元数据应该如何被解读。
User agents are not required to support meta data mechanisms. For those that choose to support meta data, this specification does not define how meta data should be interpreted.
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