### Testing
Copying selected table cells:
1. Select a fragment of table cell.
2. Use copy shortcut ctrl+C.
3. Paste somewhere in the document.
4. The pasted table should:
- be rectangular (no missing nor exceeding table cells)
- have proper headings
Note that table copy:
- have cut disabled
- paste in table is not possible
- pasted table can be fixed by a post-fixer (use content editable to verify what's being copied)