tinyfly/bootstrap — comment on commit 518955e3d1c89c4acb489f777d6891f785f90f73
File: bootstrap.css line 2571
By tinyfly:

That's a good point. Though, a class like `span-mycustom` would still cause conflict. Rather than change the selector it's simpler for people to know that they just need to stay away from using `span` in their classes totally. It seems like it would cause more confusion if you could use `span` in some variations but not others.