objectId property
A user-supplied object ID.
If specified, the ID must be unique among all pages and page elements in the presentation. The ID should start with a word character [a-zA-Z0-9_] and then followed by any number of the following characters [a-zA-Z0-9_-:]. The length of the ID should not be less than 5 or greater than 50. If empty, a unique identifier will be generated.
Implementation
core.String? objectId;