WEBGL_compressed_texture_s3tc

WebGL Extension

Both Fingerprinting Signal

What is WEBGL_compressed_texture_s3tc?

The WEBGL_compressed_texture_s3tc extension is part of the WebGL API and exposes four S3TC compressed texture formats. S3TC is a group of texture compression algorithms (also known as DXT or DXTC). Provides COMPRESSED_RGB_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT1_EXT, COMPRESSED_RGBA_S3TC_DXT3_EXT, and COMPRESSED_RGBA_S3TC_DXT5_EXT. These formats are supported primarily on desktop GPUs. Use with compressedTexImage2D() and compressedTexSubImage2D().

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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