The reason that w3schools is at the top of the search results is that more people find it useful that MDN. Perhaps it isn't as cool with the hipsters as MDN, but for people trying to get things done w3schools is more useful in my opinion.
I think the comment about 'hipsters' is a little shallow, but it's interesting that this is so divided. I really assumed that HN would be completely in the tank for MDN.
I like nice designs myself (I'm currently building a new site and I'm getting inspiration from roon.io and other beautifully designed sites), but I'm also quite content using sites that have less-than-ideal designs if they do the job that I'm looking for.
So, if you've always used MDN you really must be a young whippersnapper :)
I think MDN has an advantage in that they've only really been around since HTML5 has become standardized, whereas w3schools has had to deal with the changing standards of html4/xhtml/html5.
"...whereas w3schools has had to deal with the changing standards of html4/xhtml/html5."
=> These differences are 99.99% additions, so don't impact documentation that much. In any case, documentations is more relevant is it documents implementations, not standards (which come after implementation most of the time, not the other way around until recently)
Stackoverflow seems to be the place where my JS searches lead me.
Damn those "hipsters" and their preference for valuing getting a real useful answer over an easy to read wrong answer!
Anyway, I see why w3fools decided to remove the list of now-fixed "errors". Thanks for wasting 15 minutes of my time - I'll bill you later :)
PS, your website fails w3c validation.