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Is there documentation for classes option for Django fieldset?

In the Django admin docs, it mentions fieldsets. The example they specify a class collapse. This class will make the fieldset collapsible in the admin page. I found 2 other examples of a classes one could use. I found looking for a list of other classes I can use is wide or extrapretty. Other than these examples I have not been able to find anything else about the classes option in the fieldset