I never use W3Schools but I have to say that I sort of feel bad about that because as a policy thing perhaps one should use something that has improved on bad behavior to become good in order to reward the improvement.

Of course improvement without expectation of reward shows a higher moral stature, but it is a stature that is perhaps not to be expected, whereas improvement based on reward seems more likely to exist in our world - given studies of the matter.

If you use the site after it got corrected the difference is nil :)