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The true question is, why were we forced to stop IE's box model which was great and made sense to only now have a half-available box-sizing: border-box attr.

No kidding. The nightmare I went through trying to make a fluid CSS layout with more than one column. My god! The time I wasted! Arg!!!!!

Then again, ideally fluid layouts with multiple columns would use (ta-daaa) columns: http://caniuse.com/#feat=multicolumn

thats the same question i asked me right now too :D

always these problems with width and 100% - i def. give it a try in the next project!!

You likely want to use box-sizing: border-box instead, it's simpler and more efficient: http://paulirish.com/2012/box-sizing-border-box-ftw/

Yep exactly, this is making my layouts a lot easier lately.