It is set to YES in PlatformWebView by tests that need it, and it should be reset between tests as to not affect behavior in other tests.
<rdar://problem/60272692>
Created attachment 393485 [details] Patch
rdar://problem/60272692
Comment on attachment 393485 [details] Patch Clearing flags on attachment: 393485 Committed r258414: <https://trac.webkit.org/changeset/258414>
All reviewed patches have been landed. Closing bug.