Currently the 'facets-dropdown' class added to the JS generated select element is not able to be altered or added to. Considering the wide use of theme libs like bootstrap, it would be very handy to be able to expand on the 'facets-dropdown' class.

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ac created an issue. See original summary.

dragos-dumi’s picture

Closing this as duplicate of #2896166: facets-item-list.html.twig overrides attributes, and they replaced by JS for certain widgets. After that gets fixed, you will be able to add class into preprocessor from your theme and will be preserved to