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Re:Bootstrap 4 alpha by luiz-pv9 on Wednesday August 19, 2015 @01:09PM (#10086915)
"Dropping support for IE8 means we can take advantage of the best parts of CSS without being held back with CSS hacks or fallbacks".

This sure contributed to reducing the size.

Re:Bootstrap 4 alpha by mdo on Wednesday August 19, 2015 @02:01PM (#10087286)
We had so few IE8 specific hacks. I don't think it really made a large impact honestly.
Re:Bootstrap 4 alpha by scott_karana on Wednesday August 19, 2015 @02:01PM (#10087287)
Similarly, jQuery 2 shrunk 12% because of cutting out IE≤8 hacks: http://blog.jquery.com/2013/04/18/jquery-2-0-released/