:even Selector :even 1.0 Selects even elements, zero-indexed. See also :odd.

As of jQuery 3.4, the :even pseudo-class is deprecated. Remove it from your selectors and filter the results later using .even() (available in jQuery 3.5.0 or newer).

In particular, note that the 0-based indexing means that, counter-intuitively, :even selects the first element, third element, and so on within the matched set.

 Finds even table rows, matching the first, third and so on (index 0, 2, 4 etc.). Row with Index #0 Row with Index #1 Row with Index #2 Row with Index #3 ]]>