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I am using bootstrap 3 in my project. I see that Bootstrap 4 is a major rewrite of almost the entire Bootstrap project. But is there any necessity to migrate to bootstrap 4 from 3?
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Bootstrap 4 is not backward compatible with Bootstrap 3.
Update: While the answer on this question is actually very useful, I also found out that there is no such thing as an upgrade from Bootstrap 3 to 5. Those are just different toolkits. So this question is in a way obsolete.
It's not possible to integrate both bootstrap3 and bootstrap 4 because of many classes of the bootstrap library with the same name.
To make your project a bit future-proof!
http://upgrade-bootstrap.bootply.com gives an overview in code for what is different from Bootstrap 3 to 4, I suggest you visit it.
Also it seems there are several changes, regarding:
and more, as mentioned in here, which you should take into account. Notice that it also confirms what you are claiming:
Bootstrap 4 is a major rewrite of almost the entire project.
It's not that you must upgrade now or your app will live in hell, but it seems that many new cool things are happening in bootstrap-4, so the question is, do you want your app to be OK for now, or to make it a bit future-proof? It's up to you!
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