This page will load /vid.mp4 from the web root (relative path ../vid.mp4).

Notes:

• This requires a secure context (https) or http://localhost.
• For SBS 2400x2160: each eye is 1200x2160, so it will look tall/narrow by design unless your content was authored differently.
• This page is intentionally WebXR-only (no polyfill fallback).