Your experience will not be rendered, but normal default content should
still be processed and rendered as expected. at.js is a library to
support your experience, it is absolutely required to be in the header.
The modifications to page content YOU control via the target interface.
as far as i know it is a "blocking script", meaning it has to fully
execute before the next script can begin execution, but Adobe, please
correct me if i'm wrong. Even then, its a fully tested and QA cycled
script, I ...