Measures a page without exporting it: where the body starts and ends, how tall the content is, and how much room is left (negative when it overflows). Useful in tests and when tuning templates.
Value
A list with `body_top`, `body_bottom`, `available`, `used`, `free` (inches), and `footer_top`.
Examples
page_layout(bb_page("Hello"))$free
#> [1] 9.875