Prince can create PDF bookmarks that link to document content.
PDF bookmarks have numeric levels that place them in a bookmark hierarchy.
For example, a bookmark at level 2 can contain nested bookmarks at level 3,
or any higher level. The level of a bookmark is controlled using the
prince-bookmark-level property, shown here
being applied to the XHTML heading elements:
h1 { prince-bookmark-level: 1 }
h2 { prince-bookmark-level: 2 }
h3 { prince-bookmark-level: 3 }
h4 { prince-bookmark-level: 4 }
h5 { prince-bookmark-level: 5 }
h6 { prince-bookmark-level: 6 }
The default value for this property is none, which inhibits the creation
of a bookmark for the element.
It is possible to control the state of the bookmark, i.e. whether the bookmark
is in an open or closed state, with the
prince-bookmark-state property.
PDF bookmarks have textual labels that by default are copied from the text
content of the element that generated the bookmark. The text of this label
may be controlled using the prince-bookmark-label
property, shown here being applied to a chapter element that has a title
attribute:
CSS
chapter {
prince-bookmark-level: 1;
prince-bookmark-label: attr(title)
}
This property can take any content value, including literal text strings and counters.
PDF bookmarks are links that display a particular part of the document when
activated. By default, a bookmark will link to the element that generated the
bookmark, which is sensible behaviour for bookmarks generated from headings
or chapter elements. It is also possible to change the target of a bookmark
using the prince-bookmark-target property,
which takes a URL directly or an attribute containing a URL:
CSS
bookmark { prince-bookmark-target: url(#intro) }
bookmark { prince-bookmark-target: attr(href) }
The default value for this property is self, referring to the element
that generated the bookmark.