Open XR supports sensors like the apple vision pro has. They never said the vision pro supports it. I don't own one so I can't verify, but the linked Wikipedia

Open XR supports sensors like the apple vision pro has. They never said the vision pro supports it. I don't own one so I can't verify, but the linked Wikipedia article already makes me doubt it can, as safari isn't based on chromium. I.e YouTube let's you watch immersive 3d 180° videos right in the browser (though very few are available on the platform, as almost nobody got VR headsets). There are also other smaller indie games.