* {
  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%);
}
