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Re:Bootstrap 4's mobile-first flexbox grid system, now used ... by rpeden on Wednesday January 11, 2017 @10:31AM (#13374588)
How big a problem is that in practice?

BS3 is so widely used at this point that point that I think it is fair to call it 'done'. Browsers aren't going to stop supporting the features it uses any time soon.

Re:Bootstrap 4's mobile-first flexbox grid system, now used ... by dabernathy89 on Wednesday January 11, 2017 @02:50PM (#13376898)
I don't think it's a big problem, but I also wouldn't call BS3 "supported". It still exists, that's about it.
Re:Bootstrap 4's mobile-first flexbox grid system, now used ... by rangibaby on Thursday January 12, 2017 @03:44AM (#13380776)
http://blog.getbootstrap.com/2015/08/19/bootstrap-4-alpha/

> When we shipped Bootstrap 3, we immediately discontinued all support for v2.x, causing a lot of pain for all our users out there. That was a mistake we won’t be making again. For the foreseeable future, we’ll be maintaining Bootstrap 3 with critical bug fixes and documentation improvements. v3 docs will also continue to be hosted after v4’s final release.

Re:Bootstrap 4's mobile-first flexbox grid system, now used ... by dabernathy89 on Saturday January 14, 2017 @01:07PM (#13399643)
Ah, that's good to hear!