If you want a real score, you must download 3DMark from Steam or the official UL Solutions website. The good news is that once you run the test locally, the "online" part kicks in immediately.
: A cross-platform ray tracing benchmark for Windows and mobile devices. Fire Strike : Designed for DirectX 11 gaming performance. Run and Review 3dmark test online
Here is a comprehensive for implementing an online version of 3DMark. If you want a real score, you must