Simplify stylesheets by changing the context node.

通过修改上下文节点简化样式表。

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If let appears outside rule, its value is computed with the document root as context node.

如果let出现在rule之外，其value以文档根作为上下文节点计算得到。

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The expression is evaluated with respect to a certain context node, which in this case is the entire document.

表达式是针对特定的上下文节点计算的，在这个例子中是整个文档。

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Each node in the flow is aware of the state or context of the session and has agreed or committed to the cause, so to speak, and thus we call it a stateful system.

FORBES: Is Your Employment Model Too Stateful?