you might try a mixture-of-classifiers, which all have an 'uncertain' range between yes and no:

In T26070#9667513, @Lofhi wrote:

Is it possible to host an instance on Toolforge? It would so appear on Toolhub.

In T26070#9131701, @Esanders wrote:

The solution here is to either add the classes used by the widget to the non-inversion selector, or to add the standard mw-no-invert class to the images.

The latter is a much better way to do this. Darkmode should not have to maintain a list of CSS classes by every extension that uses background images.

Additional examples include https://en.wikipedia.org/wiki/Entrepreneur / https://en.wikipedia.org/api/rest_v1/page/html/Entrepreneur and https://en.wikipedia.org/wiki/Chief_Executive_Officer

I wondered if this was due to the lack of URL escaping of the '%', but that appears to be a red-herring as 51%25_attack has the same pattern of errors. Oddly, the error continues to appear but depends
on the endpoint: /page/title/ works

This is a task to give any long tail use case reusers of the service to adjust.