When watching a webpage that contains an embedded video there usually is an option to view the video full screen. Typically an icon with four little corners suggesting a square. This option remains unresponsive using Orion but in Firefox it works.
Also, the 'pop-out' option does not appear in the video. A small icon with a square containing a diagonal arrow pointing to a smaller white square.
Lastly I saw this on this webpage
https://www.rtvnoord.nl/politiek/RX-838/petitie-voor-tijdelijke-gerrit-krolbrug-aangeboden-in-tweede-kamer-als-ik-er-geen-vertrouwen-in-had-stond-ik-hier-niet (video on bottom of page).

And I tried compatibility mode.
Version 1.0.0 (139), WebKit 623.1.8.0.0
Tahoe (26)