In VisionOS 2.2 (I’m on the developer beta), you can now “tap to view spatial photos and videos embedded on web pages” in Safari.
So if you’re viewing this in Safari in VisionOS 2.2 you can select and hold the image which brings up a menu where you can select “View Spatial Photo.” To view the spatial video, tap it to start it playing and then tap the fullscreen button in the upper-left corner.
The image and video are from a trip to The Morton Arboretum outside of Chicago.