doc.silverstripe.org/src/theme/assets/scss/theme/_mixins.scss

/* ============= Theme Mixins ============= */
@mixin opacity ($opacity: 0.5) {
	-webkit-opacity: 	$opacity;
	-moz-opacity: 		$opacity;
	opacity: 		$opacity;
}

@mixin scale ($factor) {
	-webkit-transform: scale($factor);
	-moz-transform: 	 scale($factor);
	-ms-transform: 		 scale($factor);
	-o-transform: 		 scale($factor);
}


@mixin background-size ($string: contain) {
    -webkit-background-size: $string;
    -moz-background-size: $string;
    -o-background-size: $string;
    background-size: $string;
}


@mixin reset-box-sizing ($size:content-box) {
  &,
  *,
  *:before,
  *:after {
    -webkit-box-sizing: $size;
	-moz-box-sizing:    $size;
	box-sizing:         $size;
  }
}

@mixin placeholder ($color: #999) {
    &::-webkit-input-placeholder { /* WebKit browsers */
        color: $color;
    }
    &:-moz-placeholder { /* Mozilla Firefox 4 to 18 */
        color: $color;
    }
    &::-moz-placeholder { /* Mozilla Firefox 19+ */
        color: $color;
    }
    &:-ms-input-placeholder { /* Internet Explorer 10+ */
        color: $color;
    }
}

@mixin box-shadow ($shaodw) {
	-webkit-box-shadow: $shaodw;
	-moz-box-shadow: $shaodw;
	box-shadow: $shaodw;
}

// generic transform
@mixin transform($transforms) {
	   -moz-transform: $transforms;
	     -o-transform: $transforms;
	    -ms-transform: $transforms;
	-webkit-transform: $transforms;
          transform: $transforms;
}
// rotate
@mixin rotate ($deg) {
  @include transform(rotate(#{$deg}deg));
}
 
// scale
@mixin scale($scale) {
	 @include transform(scale($scale));
} 
// translate
@mixin translate ($x, $y) {
   @include transform(translate($x, $y));
}
// skew
@mixin skew ($x, $y) {
   @include transform(skew(#{$x}deg, #{$y}deg));
}
//transform origin
@mixin transform-origin ($origin) {
    moz-transform-origin: $origin;
	     -o-transform-origin: $origin;
	    -ms-transform-origin: $origin;
	-webkit-transform-origin: $origin;
          transform-origin: $origin;
}