There are a couple of style checker rules and some unit tests for NPAPI (Netscape) browser plug-ins.
Pull request: https://github.com/WebKit/WebKit/pull/25089
Committed 275341@main (b11a184b89df): <https://commits.webkit.org/275341@main> Reviewed commits have been landed. Closing PR #25089 and removing active labels.
<rdar://problem/123647849>