%   \enabletrackers[fonts.goodies,math.goodies]

\setupbodyfont[lucidaot]

\starttext

    \startformula
    \left\|{a \over b}\right\|
    \left\|{x \over a}\right\|
    \left\|{x \over y}\right\|
    \left\|{b \over a}\right\|
    \left\|{b \over y}\right\|
    \stopformula

    \startformula
    \left({a \over b}\right)
    \left({x \over a}\right)
    \left({x \over y}\right)
    \left({b \over a}\right)
    \left({b \over y}\right)
    \stopformula

    \setupbodyfont[lucida]

    \startformula
    \left\|{a \over b}\right\|
    \left\|{x \over a}\right\|
    \left\|{x \over y}\right\|
    \left\|{b \over a}\right\|
    \left\|{b \over y}\right\|
    \stopformula

    \startformula
    \left({a \over b}\right)
    \left({x \over a}\right)
    \left({x \over y}\right)
    \left({b \over a}\right)
    \left({b \over y}\right)
    \stopformula

\stoptext
