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 remain in 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.