\setupbodyfont[dejavu]

\setupwhitespace
  [quarterline]

\setupblank
  [quarterline]

\starttext

    quarterline: \blank[nowhite,quarterline]
    halfline:    \blank[nowhite,halfline]
    line:        \blank[nowhite,line]
    small:       \blank[nowhite,small]
    medium:      \blank[nowhite,medium]
    big:         \blank[nowhite,big]
    done

\stoptext
