------------------------------------------------------------------------------- "Real Programmers can write assembly code in any language" - Larry Wall
Pity no one has time to expand the w3fools site - it is such a small sampling of the many antiquated things on w3schools that the two guys that own w3schools just haven't kept up to date. Given the number of topics they cover and how long it would take to keep each up to date they really need to employ a staff of a half dozen or more full timeers if they really want to keep their site up to date - rather than just treating it as a hobby.
If they hadn't got such a misleading domain name then their site would be long gone by now - some sections of it are so out of date.
Both sites suffer from not having enough people to properly maintain them.
After reading a bit of a rant elsewhere about W3Schools I had a go at their 'CSS Quiz' just for fun. All went well until Q20 - see the attached screenshot.
I confess to thinking the answer was 'None of the above'. In fact the 'correct' answer is 1, but (and I had to look this up) the background attribute was deprecated in HTML4....
w3schools isn't - w3schools is old and becoming more and more false as the two guys that own the site are failing to apply the hundreds of weekly updates needed to keep the site current.