Also the venerable https://stackedit.io/ https://stackedit.io/. Also the new GitBook https://docs.gitbook.com/v2-changes/feature-highlights#unified-experience-b

Also the venerable https://stackedit.io/ https://stackedit.io/. Also the new GitBook https://docs.gitbook.com/v2-changes/feature-highlights#unified-experience-between-reading-and-editing https://docs.gitbook.com/v2-changes/feature-highlights#unifi... I'm sure there are a few more markdown "WYSIWYM" I'm forgetting... To build your own see also https://simplemde.com/ https://simplemde.com/. Basically CodeMirror is friendly to mixed-font syntax highlighting. Also yours truly https://mathdown.net https://mathdown.net