Normative for the current edition of the Standard, but having been identified as a candidate for removal from future revisions
This is a very blunt tool. In practice, a feature may be deprecated if it is:
1. Legacy inherited from C that serves no modern purpose. The register keyword.
2. Features hardly anybody implemented. Exported templates is the only example I am aware of. Like falling off the edge of the map.
3. Features that proved to be a bad idea, like incrementing a bool.
4. Features that proved to be wholly inadequate, like codecvt for dealing with Unicode.
5. Features that are reasonably new in C++ but obviated by new stuff. You don't need std::bind if you have lambdas.
This is my outsider's perspective; please chime in if you have standards committee insight.