XMLWorker Specific CSS

- `page-break-before` and `page-break-after` are supported but only with value `always`. When using `page-break-before` and `page-break-after` inside tags that are one element in PDF (like lists or tables) the outcome of adding a new page is unpredictable.
- Parsed HTML tables can be spread over several pages. To implement repeating headers and/or footers, set
  - `repeat-header:yes`
  - `repeat-footer:yes`
  on the tag `table` as css style.