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This paper presents the challenges and rewards of integrating active web components for mathematics, while preserving backwards-compatibility with classic publishing formats. We conclude with an outlook to the next-to-come mathematics enhancements on Authorea, and a technology wishlist for the coming year.     \ifPDF An \onlyPDF{An  ``active'' version of this paper, demonstrating the discussed features can be found at \cite{live-math}.\fi \cite{live-math}.}