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Code AnalysisIntermediate 50s

Trace: Flex Column Fill

A flex column is height:100vh with three children. The middle child needs to fill remaining space. Which works?
Starter code
/* A */ .mid{flex:1}
/* B */ .mid{height:100%}
/* C */ .mid{flex:0 0 auto}
/* D */ .mid{position:absolute}

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