CSS rules output by SASS mixin being ignored

Question

A SASS mixin which produces some CSS rules is being ignored. Chrome Dev Tools is showing the rules registered but crossed out and I cannot figure out why. I initially thought th

Answer 1

The browser is ignoring your CSS because it is not valid. The width, height, and background-position properties do not accept strings, they accept lengths (in the case of background-position, a list of lengths).

.foo {
   @include sprite(19px, 25px, -300px 0);
}

Unless you want a string, do not use quotes.