# enable `Enable Revision Control for Section Content` setting under {nav Configuration > Website > Advanced} section
# go to {nav Website & Content > Browse Website}
# enter `Content Mode` (link in top frame)
# open any content block for editing
# wait 21 second
# confirm, that:
* AJAX request to `page-revision:OnGetInfo` event has fired
* URL to that event contains `m_opener` with `d` value (in url it would look like `-d-`)
# save content block
# confirm, that you stayed within `Content Mode` and weren't redirected to `Browse Mode`