If you're looking for the best WYSIWYG HTML Editor, try Froala.
What is Froala?
A WYSIWYG HTML editor created by developers, for developers. With a powerful API and documentation, you can get started in minutes.
Easy to extend
You can literally do anything with the Froala Editor. Well-written, structured, and documented code is very easy to understand and further extend.
Out of the box plugins
There's no need to reinvent the wheel. This rich text editor comes with over 30 out of the box plugins to choose from and use in your project.
Support all popular frameworks
Here is a demo that you can use to test its features:
It's easy to integrate or migrate other editors to Froala. You can read the official documentation on the official website.