```scss
@mixin transition-transform($timing, $function: ease-out, $delay: null) {
    -webkit-transition: -webkit-transform $timing $function $delay; // Webkit / Blink
    transition: transform $timing $function $delay; // IE / Firefox > 15 / Opera 12
}

.selector {
  @include transition-transform(.6s, ease-out);
}
```