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This 3D Model Viewer will support the latest versions of
Google Chrome (including Android),
Apple Safari (including iOS). Older versions of browser, or
Microsoft Internet Explorer, are not supported, and there are no plans to support them.
You are using now(may differ).
Even if you are using latest version of a browser and you still can't not see any 3D models, your WebGL may not be working. Please access to https://get.webgl.org/, and check for the message:
Your browser supports WebGL.
Even if WebGL is working and you still can't not see any 3D models, this is an unknown problem.