The leaves are of a fixed size to allow simple calculation of element position, which is an added indirect.

这些叶子具有固定的大小，允许对元素的位置进行简单的计算，这是一个附加的迂回。

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The WITH ORDINALITY clause causes UNNEST to generate an additional column of type integer that contains the position associated with each element.

WITH ORDINALITY 子句使 UNNEST 生成另一个整数类型的列，包含与每一个元素关联的位置。

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Finding an element based on its ID, element type, or CSS class name is very useful, but what if you want to find an element based on its position in the DOM tree.

根据 ID、元素类型或 CSS 类名查找元素非常有用，但如何根据元素在 DOM 树中的位置执行查找呢？

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