External host
A 3D viewer, inside another website.
Check the real embedded experience. The viewer loads only when you choose Open viewer.
Embedded viewport
Choose a case, then open the viewer.
No model has been requested yet.
390 px tests a narrow layout, not a physical phone. Fullscreen here is requested by this parent page; it does not prove the viewer has its own fullscreen control.
A frame load event does not prove a model rendered. If Vercel sign-in or protection appears, record the blocker.
Your observations
Inspect before marking a result.
The report stays on this device. Nothing is submitted to a database.
Check the surrounding page too.
Scroll this page, use these controls and resize the frame. The parent page should remain usable while you rotate or zoom the model.
Back to test setup