rem unit mixin for SASS 3

gistfile1.scss

//Add pixel units for old browsers. The base for rem is 10. HTML font-size have to be 62.5%/20pt
@mixin font-size($val: 1.2, $important: false){
	@if $important == true {
		font-size: ($val * 10) + px !important;
		font-size: $val + rem !important;
	}
	@else {
		font-size: ($val * 10) + px;
		font-size: $val + rem;
	}

}
//Do the same with line-height. If only the font-size is given, we set the line-height 1.5 as big as the font-size. You can override this behavior by passing a 2nd param
@mixin line-height($font:1.2, $line: $font * 1.5, $important: false){
	@if $important == true {
		line-height: ($line * 10) + px !important;
		line-height: $line + rem !important;
	}
	@else {
		line-height: ($line * 10) + px;
		line-height: $line + rem;
	}
}