I’ve been playing with a few different WYSIWG markdown editors today (including the ones noted above), and the one that’s cleanest and also has the functionality I personally prefer is Slate’s “Markdown Preview” demo: https://www.slatejs.org/#/markdown-preview
Would love to get your reactions to it! One thing I particularly like about it is that it doesn’t hide the markdown characters upon render, it simply adds the styling around it, which makes it very easy to see where the styles came from.