If the evaluation of the test expression is true and does not result in a dynamic or type error, the element is considered locally valid.
如果测试表达式的计算结果为true并且没有导致动态的或类型错误，那么则认为元素在逻辑上是有效的。
If the evaluation of the test expression is true and does not result in a dynamic or type error, the element is considered locally valid.
如果测试表达式的计算结果为true并且没有导致动态的或类型错误，那么则认为元素在逻辑上是有效的。
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