FYI: kramdown is popular because it has "out-of-the-box" lots of extras built-in e.g. attribute lists, table of content generation, html blocks with inline mark

FYI: kramdown is popular because it has "out-of-the-box" lots of extras built-in e.g. attribute lists, table of content generation, html blocks with inline markdown, and so on - commonmark.js is "just" plain old vanilla markdown. Cheers.