[1] Add allow-top-navigation-by-user-activation sandbox token (domenic著, 2017-02-24 04:51:48 +09:00) https://github.com/whatwg/html/commit/8abd73ec3a56541e3f6486d3a593a8bcfd67295d

[2] New in Chrome 58  |  Web  |  Google Developers (2017-04-20 02:52:31 +09:00) https://developers.google.com/web/updates/2017/04/nic58

[3] Revamp the user activation model (mustaqahmed, 2019-12-05 04:09:23 +09:00, 2022-01-19T09:23:48.000Z) https://github.com/whatwg/html/commit/8f8c1f50158736b3cf16188377a0974a20367c8b