What each format can do
| Feature | Word | HTML | Excel |
|---|---|---|---|
| Fields and nested objects | yes | yes | yes |
| Lists / repeating rows | yes | yes | whole rows only |
| Conditionals | yes | yes | whole rows only |
| Images | yes | yes (embedded, not from external URLs) | yes |
| Headers and footers | fields and checkboxes; loops and conditions in the body | yes, including fields | yes |
| Page breaks | yes | yes | yes |