If your code passes the wrong element to the method, the code compiles fine, but might raise a runtime error or silently return no results.

如果代码给方法传递错误的元素，那么尽管代码将编绎良好，但可能会导致运行时错误或者不返回任何结果。

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Be careful when assigning values to the "id" attribute of the "action" element; any duplication here will silently fail, essentially creating a "last one wins" solution.

为“action”元素的“id”属性赋值时要小心，它遵循“末尾者胜出”的原则，重复的值是无效的。

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