I noticed that values containing underscores are visually indistinguishable from their counterpart using spaces (line 12).
The span element stores the correct string under data-original-title, so I'm not sure if there was/is a technical reason for this conversion.

I noticed that values containing underscores are visually indistinguishable from their counterpart using spaces (line 12).
The
spanelement stores the correct string underdata-original-title, so I'm not sure if there was/is a technical reason for this conversion.