Adding CSS classes and other "special attributes?"


It is possible (in v5) to add CSS classes and IDs to blocks of text like this?

Just a block of Markdown text

A second block of text with special attributes {.main .shine #the-site lang=fr}

Do I just have to enable support for Markdown Extra? According to the StackEdit home page, the tool supports “Markdown Extra,” but I have a feeling that this is no longer fully accurate.