Not sure why the date is relevant; we use working drafts from 2011: http://www.w3.org/TR/css3-gcpm/. RE `<noscript>`: http://www.w3.org/TR/html-polyglot/#elements-that-cannot-be-used . The reason I mention it is because EPUB requires XHTML so why not write code that works in both XHTML and HTML5