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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This gives you some control over presentation in the event that a user manages to submit an invalid request via legitimate means.

倘若一个用户想要通过合法手段提交无效请求，这可以给您一些显示控制。

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Therefore, any loss caused by incorrect, untrue, or invalid information shall not be the responsibility of the Event promoter.

如果由于上述信息不真实、不正确或无效所引致购票者的任何损失，推广方恕难承担。

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In the event that any such provision is determined to be invalid or otherwise unenforceable, these rules shall be construed in accordance with their terms as if the invalid or unenforceable provision was not contained therein.

WSJ: Blindfold Brackets 2013: Official Rules