Gets or sets the media box: the boundaries of the physical medium the page is displayed or printed on. Inheritable.
public PdfRectangle MediaBox { get; set; }
ISO 32000-2 §7.7.3.3, Table 31, and §14.11.2. Required; when missing or malformed, US Letter [0 0 612 792]. Setting
writes the page's own entry, which overrides an inherited one (§7.7.3.4). A mutation.