Are there online HTML editing plugins?

Question

JavaScript

Good afternoon!
There is a resource on which each user has his own page, which the user selects from a set of ready-made templates.
I would like to provide the user (not the developer) with the ability to slightly edit these templates: change the background, add an inscription, move the form.
Are there any modules that allow you to do this simply for the user?

Answer 1

Is the engine self-written?
And throw off the resource itself. Why point your finger at the sky?
themes.muffingroup.com/betheme - something like that? Settings are attached to the right.

Answer 2

WYSIWYG editor is probably what I need. I would be grateful if someone recommends a high-quality, sharpened for editing full-fledged pages, and not individual elements.