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This whole area seems to be a bit of a minefield to me - everything seems to be either way to bloated, generates poor / nonstandard html, or just downright unreliable. Are there any really good ones out there - clean, fast, reliable, etc.
It would also be good to know if there are dependencies on external libraries too (jQuery or Bootstrap spring to mind).
I've used TinyMCE for over 12 years now and it's always been a great WYSIWYG editor, which is why it's been used in many CMS's over the years. Give it a shot!