The matching algorithm is based on element ID.

这个相匹配的算法是基于元素ID的。

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Applied Rules list, select an element, an element ID, or an element CSS class.

“应用的规则”列表中，选择一个元素、元素ID或元素css类。

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Thus, while you are limited by having only one element per ID on a page, you can have many elements with the same CLASS on a page.

因此，尽管受到同一页面的每个元素只有一个ID的限制，同一页面上的多个元素仍然可以拥有相同的CLASS。

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The lawmakers haven't committed to the "biometric" ID card, and are wary of any element that might split the fragile coalition of Democrats, Republicans and outside organizations working toward agreement on a broad overhaul of immigration laws.

WSJ: Senators in Immigration Talks Mull IDs for All Workers