What an awesomely jargon-filled title! In all seriousness I love Sass. The team behind it is honestly making my life so much easier and facilitating my workflow second only to the advancement of CSS itself. I’m becoming more enamored with not worrying about keeping responsive Sass blocks in a separate file so as to reduce redundancy, so this implementation plays straight into that. This is a really clever implementation to deal with IE8 and earlier.