WebGL (Web Graphics Library) is a powerful JavaScript API designed to render interactive 3D and 2D graphics in the browser, commonly referred to as the hardware graphics card model.

Due to differences in user devices, GPU models (even identical GPU models may exhibit slight variations due to production batches and hardware differences), driver versions, and specific rendering operations, a unique identifier can be formed, known as the WebGL fingerprint (a hash value related to WebGL).

In the SupLogin client, selecting "Custom" allows users to choose their desired WebGL vendor and renderer. Selecting "Close" will use the default WebGL settings of the current computer for each browser.