WEBGL_multi_draw

The WEBGL_multi_draw extension is part of the WebGL API and allows rendering more than one primitive with a single function call. Provides multiDrawArraysWEBGL(), multiDrawElementsWEBGL(), multiDrawArraysInstancedWEBGL(), and multiDrawElementsInstancedWEBGL() methods plus gl_DrawID built-in for shaders. Improves WebGL application performance by reducing binding costs and speeding up GPU thread time with uniform data. Available in both WebGL1 and WebGL2, and implicitly enables ANGLE_instanced_arrays extension.

Modern anti-bot systems verify WebGL extensions to detect automated browsers. Mismatches between GPU hardware and available extensions are strong bot signals.

What Anti-Bot Systems Check:

• Extension availability: Does the reported GPU support these extensions?
• Extension combinations: Are the extensions typical for this GPU model?
• Consistency checks: Do reported extensions match other GPU signals?
• Missing extensions: Are expected extensions for this GPU absent?