Note that this only works when using setAttribute() and removeAttribute() on the option elements, instead of option.selected = true/false, because the MutationObserver will only pick up changes in the serialized DOM. So if the script for the custom select uses the latter and doesn't trigger a change event, you're out of luck, unfortunately.
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Note that this only works when using
setAttribute()andremoveAttribute()on the option elements, instead ofoption.selected = true/false, because the MutationObserver will only pick up changes in the serialized DOM. So if the script for the custom select uses the latter and doesn't trigger a change event, you're out of luck, unfortunately.