一些限制在于每个文档的不同标记限制为 253 个，并且不处理属性和处理指令。

Some limitations are that each document is limited to 253 distinct tags, and that attributes and processing instructions are not handled.

youdao

您只需要记住提示限制和一个事实：提示指令确实需要占用程序的一个周期。

Just keep in mind the hint restrictions as well as the fact that hint instructions do take up a cycle of your program.

youdao

惟一的限制是底层处理器必须支持新的虚拟化指令。

The only constraint is that the underlying processor must support the new virtualization instructions.

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