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WEBGL_compressed_texture_etc1
WebGL Extension
Both
Fingerprinting Signal
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What is WEBGL_compressed_texture_etc1?
The WEBGL_compressed_texture_etc1 extension is part of the WebGL API and exposes the ETC1 compressed texture format. Provides COMPRESSED_RGB_ETC1_WEBGL constant for compressing 24-bit RGB data with no alpha. Note: NOT supported with compressedTexSubImage2D(). Available in both WebGL1 and WebGL2.
Read MDN DocumentationBrowser 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.
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