Shipping half-done accessibility support for display: contents will probably be a worse experience than status quo in some scenarios, so we should gate it behind an internal-only feature flag until we're confident it's ready.
<rdar://problem/88528541>
Created attachment 450990 [details] Patch
Created attachment 450994 [details] Patch
Committed r289170 (246866@main): <https://commits.webkit.org/246866@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 450994 [details].