HTML5 API + Ambient Design = Semantic AWare Style Sheet (Sawss)
Ambient has a core fluid CSS (flexbox) framework for HTML5 sections as a presentation format without the need for structure based classes.
A live style editor built with AngularJS using ngRepeat, ngStyle, ngClass + JSON to generate a CSS.
A live style HTML editor built with AngularJS using ngRepeat, ngStyle, ngClass + JSON to generate HTML.