markdown-it [1] has a number of plugins that let you add extra features to commonmark. For adding attributes, I wrote markdown-it-attrs [2]. Combine that with a flexible static site generator, like metalsmith [3], and you have a solution adjustable to your needs.

1: https://github.com/markdown-it/markdown-it 2: https://github.com/arve0/markdown-it-attrs 3: https://metalsmith.io/