Currently, Chromium honors the Accept-CH-Lifetime only as part of main frame response headers. However, we should also provide the ability for origins to specify A-C-L opt-in as http meta-accept equiv, and honor this.
This would be similar to how Accept-CH opt-in can be specified via either HTTP response headers or meta-accept equiv.
Comment 1 by bugdroid1@chromium.org
, Jun 27 2018