Watermarks

When producing a PDF, it might be desirable to include a watermark, visible on all pages. In Prince it is easy to do so with CSS.

In order to repeat it on all pages, the watermark needs to be placed in a @page at-rule. We shall place it in the page region @prince-overlay (see Page regions) and create the watermark with generated content (see Generated content in page regions):

@page {
   @prince-overlay {
      color: rgba(0,0,0,0.8);
      content: "Watermark";
      font-size: 20pt;
   }
}

This style snippet can be saved into a watermark.css file, which will be called when generating the document: