W3Schools is not perfect but it is the best HTML/CSS reference that I've seen. The W3Fools effort is sort of well-intentioned but overly disrespectful. The supposed alternatives linked from W3Fools are hideous.
W3Fools energy would be _MUCH_ better spent on developing an alternative.
MDN: Too Mozilla centric. I certainly hate devs who make Firefox-only pages more than ones who look up on w3schools. And I've met a few of them ;)
dochub: Where are the tutorials?
Sitepoint: The structure is messy. It looks like a blog, but a historical structure is awful for learning. I want topic categories. Also lots of things I don't care about - books, courses - I just want references and tutorials! MDN is better from this side.
I'm not convinced. You're not going to kill w3schools if you don't understand why so many folks go to that site.
Personally I didn't know dochub, and might probably get back soon on this site. It's clean, and the information is useful, but only when you already understand well what you're doing. It's not for learning the Web concepts. Also, it misses direct mention of browser support for every feature.
Have you used the MDN? It's hosted by Mozilla but it's an open wiki. Almost any bug or oddity in a browser will likely be listed. There are pages for essentially every extension for most browsers as well. Webkit's extensions live at https://developer.mozilla.org/en-US/docs/CSS/CSS_Reference/W... for example.
I see the MDN catch a lot of unwarranted flack and i don't understand why. Shoot I use chrome as my main webrowser and I still spend most of my time on dochub.io (which is sources entirely from the MDN) and the MDN itself.
I use MDN, not extensively though. I like this site, it is useful and very well organized, but feature availability (browser & level) is not as well documented as in w3schools I find. Chrome is probably not the issue here, rather - let's name it - IE.
MDN is a great site, don't misunderstand me - but in this case I am not sure this is the right hoster. I used MDN for some JavaScript issues like one year ago, and it was then running well on FF but not at all on IE. Maybe they have all corrected that since, but I'm not seeing that clearly now.
dochub looks nice, but again it is not something for beginners.
Also, MDN is client only (which is one point making me say it is very Mozilla oriented). w3schools has this part about PHP which is very useful for beginners. Again, my point hasn't changed. MDN and others are more useful resources to experienced web devs than w3schools, but w3schools is the better point to begin with when you don't know about web development and want a clear overview.
W3Fools energy would be _MUCH_ better spent on developing an alternative.