It seems like something have changed at Facebook that neither OneBox nor iframe is playing inline how it’s supposed to. This was ok yesterday but just a while ago every FB source opens a new window and requires a login to Facebook.
Can anyone confirm this?
Additional note:
Other sources I have tested that plays inline fine includes YouTube, Twitch and direct from Amazon S3.
They both play fine for me here on Meta using my mobile phone and checking across DiscourseHub, Chrome and Safari. Firefox doesn’t show the embeds though, but generally my Firefox on iOS doesn’t do well with videos.