DOM support for validity, with a validity attribute for form elements, and a new invalid event.

验证的DOM支持，为表单元素增加了validity属性和新的invalid事件。

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Based on the consistency with and coverage of these event constraints by the event sequences produced by the program execution, the validity of the distributed implementation can be tested.

通过判断程序执行时所产生的事件序列集同这些事件约束集的一致性以及对约束集覆盖程度可以检测被测程序的正确性。

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Let us waive any questions concerning the validity of the principle that every event has a cause for though the question is important its discussion would lead us far afield.

我们暂不考虑万事均有因果关系这一原则是否有效，因为这一问题尽管重要，但那样的讨论将会使我们离题太远。

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