Page Boundaries

The PDF specification defines two printing medium: the finished medium (like a sheet of paper) and the intermediate medium used in prepress process (like a film or reproduction plate). The intermediate medium may contain additional content such as bleeds or printer marks that are presented outside the finished page boundaries. To handle these cases, a PDF page may define different boundaries to control each aspect:

• The media box defines the boundaries of the physical medium where the page is to be printed. It may include any extended area surrounding the finished page for bleeding, printing marks, etc.
• The bleed box defines the boundaries where the content of the page shall be cropped in a production environment. It may include any extra bleed area needed to accommodate the physical limitations of cutting, folding, and trimming equipment.
• The trim box defines the boundaries of the finished page after trimming.

The boundary can be set directly from the CSS by using the -oxy-crop-box property:

@page {
  -oxy-crop-box: trim-box;
}

@page {
  -oxy-crop-offset: 1cm;
}