@bender-tags: bug, 4.7.0, trac8584, editor
@bender-ui: collapsed
@bender-ckeditor-plugins: wysiwygarea, toolbar, undo, pastefromword, sourcearea, elementspath, list, link, basicstyles, stylescombo, font

Check if the editor is usable:

* the whole UI is rendered correctly,
* there are no errors in console, especially connected with `Content-Security-Policy`.
