Represents the "R" entry of the bead dictionary object.

It is a required entry defined as part of the PDF 1.0 specification.

It contains a RectangleElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 161, page 376.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 163, page 457.

The rectangle defines the visible passage in default user space on the bead's page. The viewer scrolls and zooms to this rectangle when navigating to this step in the article thread.