WEBGL_blend_func_extended
WebGL Extension
What is WEBGL_blend_func_extended?
The WEBGL_blend_func_extended extension is part of the WebGL API and provides extended blending capabilities with dual-source blending. Enables advanced blending operations by providing SRC1_COLOR_WEBGL, SRC1_ALPHA_WEBGL, ONE_MINUS_SRC1_COLOR_WEBGL, and ONE_MINUS_SRC1_ALPHA_WEBGL constants for use with blendFunc() and blendFuncSeparate(). Dual-source blending allows fragment shaders to output two colors that are blended together, enabling techniques like order-independent transparency. Available in both WebGL1 and WebGL2.
Read MDN DocumentationBrowser Support
- Graphics card model and capabilities
- GPU driver version
- Browser version and vendor
- Operating system
Usage in Web Scraping & Anti-Bot Bypass
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?
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