Table copied from MS Word into RichText isn't properly validated.
1. Create a new table in Word and type there some example text.
2. Change its width a little.
3. Paste it as is into the RichText field (e.g. in the newly edited or created article).
4. Hit "Save" or "Publish".
The user is presented with an error:
The attached table could also be used for testing purposes as a more complex example.