responsive design - CSS font sizing relative to parent -

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is there font sizing unit in css allows me specify sizes relative parent element;

vw , vh example relative viewport width , height respectively.

i want parent relative size responsive design. example parent element 400px wide, want text half of width, i'm not sure if can specify - or if such feature supported.

just use font-size value ising em instead of px or pt. example, if have div width , height of 400px, use font-size: xxem (where xx numeric value). alternately, can include % in font size well.


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