Generated by SassMeister.com.

SassMeister-input-HTML.haml

%h1 Hello World!

SassMeister-input.scss

// ----
// Sass (v3.4.5)
// Compass (v1.0.1)
// ----

/* override to change the default */
$default-background-size: 100% auto !default;
// Set the size of background images using px,
// width and height, or percentages.
// Currently supported in: Opera, Gecko, Webkit.
//
// * percentages are relative to the background-orgin
// (default = padding-box)
// * mixin defaults to: $default-background-size
@mixin background-size($size-1:$default-background-size ){
    foo: bar;
  }
  .block {
    @include background-size;
  }

SassMeister-output.css

/* override to change the default */
.block {
  foo: bar;
}

SassMeister-rendered.html

<h1Hello>World!</h1Hello>