legend for renderer invertedPolygonRenderer not supported about qgis2web HOT 6 OPEN

You forgot to put the shp in the zip

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can you provide an example qgis project with example data? you can upload the zip in this chat.

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Sure, the mapbox error is around mapboxLayerScripts.py, line 392:

         UnboundLocalError: local variable 'classes' referenced before assignment

So, same as leaflet.

example.qgz.zip

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Even without your data, I have verified that it is very complicated for any webgis to execute the "inverted polygon" style. In fact, qgis2web exports do not export a result because they do not export a style, i.e. the geometries are in the map, but they cannot be seen because the system fails to color them.
I don't see any other method than to act on the geometries by drawing the graphic shape reversed with respect to the current one, and applying a standard "fill" style to it.

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Apologies for the missing data, here is a re-upload
example.qgz.zip

I think for me, properly supporting inverted polygons is secondary (and low priority) compared to simply "not crashing" during the output; the existing "not supported" warning is probably enough.

My change which appears to work for leaflet exporter is as follows:
qgis2web/leafletLayerScripts.py:

356         else:          
357             feedback.showFeedback(
358                 """Layer {}: legend for renderer {}
359                  not supported""".format(layer.id(), renderer.type()))
360                                            
361             classes = None                 
362         legend = layer.name().replace("'", "\\'") + "<br />"
363         if classes is not None:                                                                                     
364             legend += "<table>"            
365             for cnt, c in enumerate(classes):
366                 symbol = c.symbol()
367                 legend = iconLegend(symbol, c, outputProjectFileName,
368                                 safeLayerName, legend, cnt)
369             legend += "</table>"
370             symbol = classes[0].symbol()
371         else:
372             symbol = None
373     return (legend, symbol) 

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It's not just a matter of python code, webgis can't stylize inverted polygons like qgis does, you have to draw correct polygons and stylize them normally.
You have to choose the "single symbol" item in qgis or the "categorized" item

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