>>>>As you discovered it all changed in 4.0.
>>>>If something is not working as expected in bootstrap the first thing to do is check bootstrap.css and make sure that the classes you at trying to use are actually defined :=}
>>
>>>IMHO, this is not good (I want to use a stronger word but don't want to offend anybody at Bootstrap :)). If I were upgrade my older project (where I used Bootstrap 3) with Bootstrap 4, many things would break. I always thought that a good practice for a software is to be backwards compatible. I guess no one listens to me : )
>>
>>
>>+1
>>We'll wait a while before migrating FoxInCloud from Bootstrap 3 to 4
>>
>>At least their versioning complies with SemVer
>
>It is always smart move to wait for the dust to settle after software upgrades.
>
>Another upsetting thing was that both Viv and I were looking at this page
>https://v4-alpha.getbootstrap.com/layout/responsive-utilities/ and trying to figure out how to make it work. And only yesterday I noticed that at the top of the page it says "This is an outdated alpha release - please visit the latest Bootstrap 4 stable release." This banner is barely noticeable. Why not remove the page from the site at all?!


"Bootstrap 4 is a major rewrite of the entire project"
I'll concentrate on https://getbootstrap.com/docs/4.0/migration/