cross browser - Is it safe to use calc in CSS? -

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this data caniuse http://caniuse.com/#feat=calc suggests practically browsers support calc in css. there reasons still avoid using calc consumer websites? have major websites started using calc?

the official level candidate recommendation w3c , descripted in draft document css values , units module level 3

candidate recomendation not approved near, (i think) 'a choice comforted state of documentation of w3c


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