In CSS when using a selector list, if any of the selectors are invalid then the whole list is deemed invalid. When using :is() or :where() instead of the whole list of selectors being deemed invalid if one fails to parse, the incorrect or unsupported selector will be ignored and the others used.

When only condition is provided, this function is a shorthand fornp.asarray(condition).nonzero(). Using nonzero directly should bepreferred, as it behaves correctly for subclasses. The rest of thisdocumentation covers only the case where all three arguments areprovided.




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