1. Click "Init editor". 2. Expected: * The containers should fill up with the respective editor UI. * There should be a toolbar with "Heading", "Bold", "Italic", "Undo" and "Redo" buttons. 3. Click "Destroy editor". 4. Expected: * Editor should be destroyed. * The editor UI should disappear from the containers. * The 'ck-body region' should be removed. ## Notes: * You can play with: * `editable.isReadOnly`, * Changes to `editable.isFocused` should be logged to the console. * Features should work.