Question

Is it possible to get the value of a property defined through a mixin for a selector within another selector. For example:

@mixin mymixin($mywidth) {
  width: $mywidth;
}

div {
  @include mymixin(90%);
}

p {
  width: (20 / (([GET_SOMEWAY_DIV_WIDTH] * 960) / 100)) * 100;
}

Answer 1

Use a variable:

$mywidth: 90%;

div {
    width: $mywidth;
}

p {
    width: (20 / (($mywidth * 960) / 100)) * 100;
}

---

Edit re: OP edit. AFAICS, when using mixin arguments, those values are only accessible within the scope of the mixin, when the mixin is included. Refactor so that you pass a variable to the included mixin:

$mywidth: 90%;

@mixin mymixin($mywidth) {
  width: $mywidth;
}

div {
  @include mymixin($mywidth);
}

p {
  width: (20 / (($mywidth * 960) / 100)) * 100;
}