Online HTML WYSIWYG editor

Here You go
\rckeditor.com/

Universal giant can be called the Dreamweaver, embed videos, etc. simply. It is quite suitable for the novice user.
But of course he paid and quite expensive.

tinymce is a versatile and powerful WYSIWYG editor. If you do not mind its size and therefore the download speed. Then select it. Plugins to upload images and videos there, himself used. You can customize almost anything.

You can try to take as a basis tinymce, plugins under it there are all sorts. in the extreme case — to find someone who finished.

TinyMCE (http://tinymce.moxiecode.com/)
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Examples: tinymce.moxiecode.com/examples/full.php
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> Button to cut (copy and paste)
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The default will not work at all WYSIWYG editors (requires additional traffic from users)
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> Form upload and insert images
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There are paid plugins:
* MCImageManager
* MCFileManager
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Pros:
+ good documentation
+ very easy to create your own plug-ins (buttons, commands, etc.)
+ styles can be created
+ in the latest versions of all the formatting is bypassing of standard commands of the browser, so you can assign the desired appearance for all styles (bold, italic, etc.)

I'm in first place in requirements usually put a "normal copy-paste from word".
Now in production use tinymce, but glancing at elrte.org/ru/