<===> input.scss
@document url(http://www.w3.org/),
               url-prefix(http://www.w3.org/Style/),
               domain(mozilla.org),
               regexp("https:.*");

<===> output.css
@document url(http://www.w3.org/),
               url-prefix(http://www.w3.org/Style/),
               domain(mozilla.org),
               regexp("https:.*");