Hello @benjamin_bnds
J’ai regardé les sources et ils arrivent au même niveau que foundation concernant ces points :
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Moved from Less to Sass. Bootstrap now compiles faster than ever thanks to Libsass, and we join an increasingly large community of Sass developers.
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Improved grid system. We’ve added a new grid tier to better target mobile devices and completely overhauled our semantic
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Brand new customization options. Instead of relegating style embellishments like gradients, transitions, shadows, and more to a separate stylesheet like v3, we’ve moved all those options into Sass variables.
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Dropped IE8 support and moved to rem and em units. Dropping support for IE8 means we can take advantage of the best parts of CSS without being held back with CSS hacks or fallbacks. Pixels have been swapped for rems and ems where appropriate to make responsive typography and component sizing even easier. If you need IE8 support, keep using Bootstrap 3.
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Improved documentation. We rewrote it all in Markdown and added a few handy plugins to streamline examples and code snippets to make working with our docs way easier. Improved search is also on it’s way.
Mais je ne suis pas objectif car j’ai toujours préféré foundation car leur implémentation des mixins est – selon moi – meilleure
Cheers!