Used with [append_placeholder_slides()] to build placeholder slide types.
Arguments
- role
A layout role (see [placeholder_layouts()]).
- ...
Text for the role's fields, e.g. `title =`, `subtitle =`, `text =`. Each value may be a character vector or a list (one paragraph per element). `NULL` leaves that placeholder empty.
- to_page
A fixed page for this slide. `NULL` (the default) places it after the previous slide described in the same call.