WebXR API Emulator - Chrome Web Store (google.com)
That’s the best tool I know for testing XR without owning a device. As for the examples, I think you’ll just need to spend a little time with them to figure out how to use them — and as always, if you get stuck, feel free to open new specific questions on the forum (or search for old ones; we’ve had lots of good WebXR discussions over the years). Sounds like you’re on the right track!
thank you 