* { unknown: x (a+b) }
* { unknown: x (a-b) }
* { unknown: x (a,b) }
* { unknown: x [a,b] }
* { unknown: x {a,b} }
* { unknown: x ( a + b ) }
* { unknown: x ( a / b ) }
* { unknown: x ( a * b ) }
/** { unknown: x ( a - b ) }*/
* { unknown: x ( a , b ) }

a { b: c, d }
a { b: c, (d, e) }
a { b: c, d, e }
a { b: c, (d, e), f }

a {
    grid-template-rows: [linename1 linename2] 100px repeat(auto-fit, [linename1] 300px) [linename3];
    grid-template-rows: [linename1 linename2] 100px repeat(4, [col-start] min-content [col-middle] max-content [col-end]) 1fr [linename3];
    grid-template: [linename] 100px / [columnname1] 30% [columnname2] 70%;
    grid-template: fit-content(100px) / fit-content(40%);
}
