I have written this article completely in the ScApp (Sciter Application) named BlockNote for the Net:
It is a part of Sciter SDK and reside in sdk/scapps/blocknote.net/ folder.
Eventually this will replace outdated BlockNote v.1.8 application. Plan is to create platform for comfortable content editing in Internet. E.g. as an editor it is already more convenient than built-in editor of the WordPress application I am using here.