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How Can I Use Equal And Query Mark In Class Slug?

I would like so as to add a query mark and equal the class url.

I would like this:
web site.com/stack?alternate=ask

However WordPress doesn’t permit particular characters in url. So i attempted to make use of html encodes in class slug. Like as
web site.com/stackpercent3Fexchangepercent3Dask

Thus, the url proven with html encodes and this class doesn’t record the merchandise.

How can i exploit "?" and "=" within the class slug?

Regards