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EXT_float_blend

WebGL Extension

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What is EXT_float_blend?

The EXT_float_blend extension is part of the WebGL API and allows blending and draw buffers with 32-bit floating-point components. Automatically enabled when WEBGL_color_buffer_float or EXT_color_buffer_float are enabled. Prevents INVALID_OPERATION errors when calling drawArrays() or drawElements() with blending enabled on 32-bit float draw buffers. Available in both WebGL1 and WebGL2.

Read MDN Documentation

Browser Support

Checking Extension Support
This extension is part of the Both specification. Browser support varies based on:
  • 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?
Scrapfly's Anti-Scraping Protection (ASP)
Scrapfly automatically manages WebGL fingerprint consistency, ensuring all extensions match the emulated GPU profile. This prevents detection by anti-bot systems that verify WebGL data.
Learn About ASP Bypass

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